Renesas H8S/2138 Series Manual

Hitachi Single-Chip MicrocomputerH8S Series Technical Q&AH8S/2655H8S/2350H8S/2355H8S/2357H8S/2345H8S/2245H8S/2148H8S/2144H8S/2138H8S/2134H8S/2128H

Microcomputer Technical Q&A2Q&A No.: QAH8S-002Category: CPUSubject: Difference between V Flag and C Flag in CCRQuestionThe V flag and C flag i

Microcomputer Technical Q&A92Q&A No.: QAH8S-218Category: TPUSubject: Non-Timer Use of PortQuestionHow can the TIOC I/O port be used for a purp

Microcomputer Technical Q&A93Q&A No.: QAH8S-219Category: TPUSubject: Cascaded ConnectionQuestionCan cascaded connection be used with the TPU?A

Microcomputer Technical Q&A94Q&A No.: QAH8S-220Category: TPUSubject: Dual Use of PWM Mode 1 and Input CaptureQuestionWhen TPU channels 0 and 3

Microcomputer Technical Q&A95Q&A No.: QAH8S-221Category: TPUSubject: Setting PWM Mode 2 CycleQuestionWhich register is used to set the cycle i

Microcomputer Technical Q&A96Q&A No.: QAH8S-222Category: TPUSubject: Synchronous Operation of Two SetsQuestionIs synchronous operation of two

Microcomputer Technical Q&A97Q&A No.: QAH8S-223Category: TPUSubject: Two-Phase PWM OutputQuestionIs it possible to obtain two-phase PWM output

Microcomputer Technical Q&A98Applicable ProductsApplicability Series Applicability Series Applicability SeriesEntire H8S Series Yes H8S/2655 Yes H

Microcomputer Technical Q&A99Q&A No.: QAH8S-224Category: WDTSubject: Interval Timer with Arbitrary Time IntervalQuestionWhen the WDT is used a

Microcomputer Technical Q&A100Q&A No.: QAH8S-225Category: SCISubject: SCI InitializationQuestionIn SCI initialization, why is there a minimum

Microcomputer Technical Q&A101Q&A No.: QAH8S-226Category: SCISubject: Difference between TDRE Flag and TEND FlagQuestionWhat is the difference

Microcomputer Technical Q&A3Applicable ProductsApplicability Series Applicability Series Applicability SeriesYes Entire H8S Series H8S/2655 H8S/23

Microcomputer Technical Q&A102Q&A No.: QAH8S-227Category: SCISubject: Initial State of TxD PinQuestionWhat happens to the initial value of the

Microcomputer Technical Q&A103Q&A No.: QAH8S-228Category: SCISubject: Maximum External Clock Input Value (Asynchronous Mode)QuestionWhat is th

Microcomputer Technical Q&A104Q&A No.: QAH8S-229Category: SCISubject: Transmit/Receive Operation in Synchronous ModeQuestionCan reception alon

Microcomputer Technical Q&A105Q&A No.: QAH8S-230Category: SCISubject: SCI Transmission Using DTCQuestionIs it possible to performs SCI transmi

Microcomputer Technical Q&A106Q&A No.: QAH8S-231Category: SCISubject: Permissible Bit Rate Error in Asynchronous ModeQuestionWhat is the permi

Microcomputer Technical Q&A107012340123 4 567P5 5 6 7 8 150 1 5 6 7 8 141501316 clocks160 clocksStart Stop StartTYP.ABCLKRxD (Typ)RxD (Typ)RxD (Mi

Microcomputer Technical Q&A108However, if the transmitting side is fast, the next frame will begin before completion of the receiveoperation, and

Microcomputer Technical Q&A109Q&A No.: QAH8S-232Category: SCISubject: Operation of RDRF FlagQuestionAn operation to clear the RDRF flag to 0 i

Microcomputer Technical Q&A110Q&A No.: QAH8S-233Category: SCISubject: RDRF Flag Set TimingQuestionsWhen data reception ends, the RDRF flag is

Microcomputer Technical Q&A111Answers1. The RDRF flag is set following the fall of the data sampling clock after the stop bit data isreceived (see

Microcomputer Technical Q&A4Q&A No.: QAH8S-003Category: CPUSubject: Relationship between Data Size and Change of V FlagQuestionDo changes of t

Microcomputer Technical Q&A1122. The RDRF flag is set following the fall of the serial clock after the MSB data is received (seefigure below).Bit

Microcomputer Technical Q&A113Q&A No.: QAH8S-234Category: SCISubject: Interrupt Source Flag ClearingQuestionIf a receive-error interrupt is ge

Microcomputer Technical Q&A114Q&A No.: QAH8S-235Category: SCISubject: Continuous Transmission/Reception in Synchronous Mode UsingExternal Cloc

Microcomputer Technical Q&A115Q&A No.: QAH8S-236Category: SCISubject: Use of RDR and TDR when SCI is Not UsedQuestionsCan the following regist

Microcomputer Technical Q&A116Q&A No.: QAH8S-237Category: SCISubject: SCI Clock Pin Input/Output SettingQuestionWhen the SCI is used, is the i

Microcomputer Technical Q&A117Q&A No.: QAH8S-238Category: SCISubject: Serial Internal I/O Pin StatesQuestionAfter the TxD, RxD, and SCK pins—w

Microcomputer Technical Q&A118Q&A No.: QAH8S-239Category: SCISubject: Setting Asynchronous ModeQuestionWhen performing asynchronous mode trans

Microcomputer Technical Q&A1192. Performing first byte setting at the same time as SCI settingSCI setting processingInterrupt waitCounter setting:

Microcomputer Technical Q&A120In both of the above cases, the TXI interrupt handling routine flowchart is as shown below.TXI interruptcount++count

Microcomputer Technical Q&A121Q&A No.: QAH8S-240Category: SCISubject: Data Transfer to TDRQuestionsSRAMH8S Series chipData transmission SCIDMA

Microcomputer Technical Q&A5Q&A No.: QAH8S-004Category: CPUSubject: Area Usable as ROM in Vector TableQuestions1. Can a free area in the vecto

Microcomputer Technical Q&A122Applicable ProductsApplicability Series Applicability Series Applicability SeriesYes Entire H8S Series H8S/2655 H8S/

Microcomputer Technical Q&A123Q&A No.: QAH8S-241Category: SCISubject: TDRE Flag Set TimingQuestionsWhen data transmission ends, the TDRE flag

Microcomputer Technical Q&A124AnswersThe TDRE set timing differs depending on whether or not the transmit shift register (TSR)contains transmit da

Microcomputer Technical Q&A125b. When TSR does not contain transmit data (see figure below)9910111213141516 1 2 3 4 5 6 7 8 10111213141516 1 2 3 4

Microcomputer Technical Q&A1262. Synchronous modea. When TSR contains transmit data (see figure below)When SCK clock source is internal clock: 2 s

Microcomputer Technical Q&A127Q&A No.: QAH8S-242Category: SCISubject: Phases of System Clock and SCKQuestionIs SCK (the serial clock transfer

Microcomputer Technical Q&A128Q&A No.: QAH8S-243Category: A/D ConverterSubject: Idea Behind External C and RQuestionWhat is the idea behind th

Microcomputer Technical Q&A129A/D converter equivalent circuitCAD ≈ 20 pFRAD ≈ 10 kΩRoutLow-pass filter CPermissible signal source impedanceSensor

Microcomputer Technical Q&A130Q&A No.: QAH8S-244Category: A/D ConverterSubject: A/D Conversion in Simultaneous Sampling OperationQuestionHow d

Microcomputer Technical Q&A131Applicable ProductsApplicability Series Applicability Series Applicability SeriesEntire H8S Series Yes H8S/2655 H8S/

Microcomputer Technical Q&A6Q&A No.: QAH8S-005Category: CPUSubject: H8S/2000 CPU Normal ModeQuestionAre any precautions required when making a

Microcomputer Technical Q&A132Q&A No.: QAH8S-245Category: A/D ConverterSubject: A/D Conversion Time in Simultaneous Sampling OperationQuestion

Microcomputer Technical Q&A133Applicable ProductsApplicability Series Applicability Series Applicability SeriesEntire H8S Series Yes H8S/2655 H8S/

Microcomputer Technical Q&A134Q&A No.: QAH8S-246Category: I/O PortsSubject: I/O Port ManipulationQuestionWhen a particular bit of an I/O port

Microcomputer Technical Q&A135Q&A No.: QAH8S-247Category: I/O PortsSubject: Reserved BitsQuestionWrite data rules are sometimes given for rese

Microcomputer Technical Q&A136Q&A No.: QAH8S-248Category: I/O PortsSubject: Disabling φ OutputQuestionIs there any way of fixing φ output high

Microcomputer Technical Q&A137Q&A No.: QAH8S-249Category: I/O PortsSubject: Port 3 Open-Drain OutputQuestionPort 3 pins are multiplexed as SCI

Microcomputer Technical Q&A138Q&A No.: QAH8S-250Category: I/O PortsSubject: Multiplexing as IRQ3 and LWRQuestionThe PF3 pin is also multiplexe

Microcomputer Technical Q&A139Q&A No.: QAH8S-251Category: Clock Pulse GeneratorSubject: Crystal Resonator Capacitance ValueQuestionCrystal res

H8S Series Technical Q&A Application NotePublication Date: 1st Edition, February 1998Published by: Semiconductor and IC Div.Hitachi, Ltd.Edited by

Microcomputer Technical Q&A7Q&A No.: QAH8S-006Category: CPUSubject: MAC RegisterQuestionWhy is the MAC register 42 bits long?AnswerThe MAC reg

Microcomputer Technical Q&A8Q&A No.: QAH8S-007Category: CPUSubject: EXR RegisterQuestionWhy has the EXR registers been added?AnswerThere are t

Microcomputer Technical Q&A9Q&A No.: QAH8S-008Category: InstructionSubject: SUBX InstructionQuestionWhy is the Z flag value unchanged when the

Microcomputer Technical Q&A10Q&A No.: QAH8S-009Category: InstructionSubject: BRN InstructionQuestionWhat kind of instruction is BRN (BF)?Answe

Microcomputer Technical Q&A11Q&A No.: QAH8S-010Category: InstructionSubject: Difference between BRA Instruction and JMP InstructionQuestionWha

NoticeWhen using this document, keep the following in mind:1. This document may, wholly or partially, be subject to change without notice.2. All rig

Microcomputer Technical Q&A12Q&A No.: QAH8S-011Category: InstructionSubject: BRA and BRN InstructionsQuestions1. What does it mean when the BR

Microcomputer Technical Q&A13Q&A No.: QAH8S-012Category: InstructionSubject: Support of DAA (DAS) Instruction Corresponding to INC (DEC)Instru

Microcomputer Technical Q&A14Q&A No.: QAH8S-013Category: InstructionSubject: Odd Address Value when STC Instruction is ExecutedQuestionThe man

Microcomputer Technical Q&A15Q&A No.: QAH8S-014Category: InstructionSubject: Stack PrecautionsQuestionAre any precautions required concerning

Microcomputer Technical Q&A16Q&A No.: QAH8S-015Category: InstructionSubject: Stack PointerQuestionHow should the stack pointer (SP: ER7) be in

Microcomputer Technical Q&A17Q&A No.: QAH8S-016Category: InstructionSubject: TAS InstructionQuestionWhat is the meaning of the test and set in

Microcomputer Technical Q&A18Q&A No.: QAH8S-017Category: InstructionSubject: BLD and BIST InstructionsQuestionHow are bit-manipulation instruc

Microcomputer Technical Q&A19Applicable ProductsApplicability Series Applicability Series Applicability SeriesYes Entire H8S Series H8S/2655 H8S/2

Microcomputer Technical Q&A20Q&A No.: QAH8S-018Category: InstructionSubject: BOR and BIAND InstructionsQuestionHow are bit-manipulation instru

Microcomputer Technical Q&A21Applicable ProductsApplicability Series Applicability Series Applicability SeriesYes Entire H8S Series H8S/2655 H8S/2

PrefaceThe H8S/2000 Series is a new series of Hitachi-original high-performance 16-bit microcomputersdesigned to offer higher performance and lower po

Microcomputer Technical Q&A22Q&A No.: QAH8S-019Category: MCU Operating ModesSubject: Mode PinsQuestions1. Is it possible to change the MCU ope

Microcomputer Technical Q&A23Q&A No.: QAH8S-020Category: MCU Operating ModesSubject: Use of RAME BitQuestionHow is the RAME bit used?AnswerThe

Microcomputer Technical Q&A24Q&A No.: QAH8S-021Category: Exception HandlingSubject: ResetQuestionA reset time of at least 20 ms is specified.

Microcomputer Technical Q&A25Applicable ProductsApplicability Series Applicability Series Applicability SeriesYes Entire H8S Series H8S/2655 H8S/2

Microcomputer Technical Q&A26Q&A No.: QAH8S-022Category: InterruptsSubject: Handling of Interrupt Requests when IRQ Interrupts areDisabledQues

Microcomputer Technical Q&A27Q&A No.: QAH8S-023Category: InterruptsSubject: Handling of Interrupt Requests when Interrupts are MaskedQuestionI

Microcomputer Technical Q&A28Q&A No.: QAH8S-024Category: InterruptsSubject: Use of IRQ Status RegisterQuestionThe IRQ status register (ISR) ca

Microcomputer Technical Q&A29Q&A No.: QAH8S-025Category: InterruptsSubject: Interrupt Disable Timing (1)QuestionWhen a supporting module inter

Microcomputer Technical Q&A30Q&A No.: QAH8S-026Category: InterruptsSubject: Interrupt Disable Timing (2)QuestionWhen an interrupt enable bit i

Microcomputer Technical Q&A31Q&A No.: QAH8S-027Category: InterruptsSubject: Interrupt Immediately after ResetQuestionIs an interrupt ever gene

Using this Application NoteThis Application Note is a compilation of responses to queries from Hitachi microcomputer users,presented in Question and A

Microcomputer Technical Q&A32Q&A No.: QAH8S-028Category: InterruptsSubject: Simultaneous IRQ Interrupts of the Same PriorityQuestions1. With e

Microcomputer Technical Q&A33Q&A No.: QAH8S-029Category: InterruptsSubject: Use of Different Interrupt ModesQuestionThere are four interrupt c

Microcomputer Technical Q&A34Applicable ProductsApplicability Series Applicability Series Applicability SeriesYes Entire H8S Series H8S/2655 H8S/2

Microcomputer Technical Q&A35Q&A No.: QAH8S-030Category: InterruptsSubject: Insufficient Number of External InterruptsQuestionCan any substitu

Microcomputer Technical Q&A36Q&A No.: QAH8S-031Category: Bus ControllerSubject: CS State in On-Chip RAM and Internal I/O AccessQuestionIs the

Microcomputer Technical Q&A37Q&A No.: QAH8S-032Category: Bus ControllerSubject:φ Clock State when Bus is ReleasedQuestionIs the φ clock output

Microcomputer Technical Q&A38Q&A No.: QAH8S-033Category: Bus ControllerSubject: WAIT (1)QuestionWhen programmable waits are inserted and the p

Microcomputer Technical Q&A39Q&A No.: QAH8S-034Category: Bus ControllerSubject: WAIT (2)QuestionThe description of the pin wait function state

Microcomputer Technical Q&A40Applicable ProductsApplicability Series Applicability Series Applicability SeriesYes Entire H8S Series H8S/2655 H8S/2

Microcomputer Technical Q&A41Q&A No.: QAH8S-035Category: Bus ControllerSubject: Program Wait Switchover TimingQuestionAfter a power-on reset,

iContentsCPUCPUSubject: Use of General Registers... 1Subj

Microcomputer Technical Q&A42Applicable ProductsApplicability Series Applicability Series Applicability SeriesYes Entire H8S Series H8S/2655 H8S/2

Microcomputer Technical Q&A43Q&A No.: QAH8S-036Category: Bus ControllerSubject: BREQ Acceptance in Power-Down ModesQuestions1. Is BREQ accepte

Microcomputer Technical Q&A44Q&A No.: QAH8S-037Category: Bus ControllerSubject: External Connection of RAM to 8-Bit-Access SpaceQuestionWhen R

Microcomputer Technical Q&A45Q&A No.: QAH8S-038Category: Bus ControllerSubject: Bus Controller Settings for Area 7QuestionArea 7 includes a mi

Microcomputer Technical Q&A46Applicable ProductsApplicability Series Applicability Series Applicability SeriesEntire H8S Series Yes H8S/2655 Yes H

Microcomputer Technical Q&A47Q&A No.: QAH8S-039Category: Bus ControllerSubject: External Bus states during CPU OperationQuestions1. What is th

Microcomputer Technical Q&A48Q&A No.: QAH8S-040Category: Bus ControllerSubject: Internal I/O Register Access when Bus is ReleasedQuestionWhen

Microcomputer Technical Q&A49Q&A No.: QAH8S-041Category: Bus ControllerSubject: CS Signals after Power-On ResetQuestionWhat is the state of th

Microcomputer Technical Q&A50Q&A No.: QAH8S-042Category: Bus ControllerSubject: Bus Release Wait Time after BREQ InputQuestionIn what circumst

Microcomputer Technical Q&A51Q&A No.: QAH8S-043Category: Bus ControllerSubject: External Bus Right Release and Refresh ControlQuestionAre refr

iiSubject: Use of Different Interrupt Modes... 33Subject: Insufficient

Microcomputer Technical Q&A52Q&A No.: QAH8S-044Category: Bus ControllerSubject: 2-CAS DRAM InterfaceQuestionPlease explain the use of the LCAS

Microcomputer Technical Q&A53Applicable ProductsApplicability Series Applicability Series Applicability SeriesEntire H8S Series Yes H8S/2655 H8S/2

Microcomputer Technical Q&A54Q&A No.: QAH8S-045Category: Power-Down StateSubject: Medium-Speed ModeQuestionWhy is it that, in medium-speed mod

Microcomputer Technical Q&A55Q&A No.: QAH8S-046Category: Power-Down StateSubject: Oscillation Settling Wait Time after Software Standby ModeQu

Microcomputer Technical Q&A56Q&A No.: QAH8S-047Category: Power-Down StateSubject: On-Chip Supporting Modules in Software Standby ModeQuestionW

Microcomputer Technical Q&A57Q&A No.: QAH8S-048Category: Power-Down StateSubject: Mode Pins (MD2 to MD0) in Hardware Standby ModeQuestionHow d

Microcomputer Technical Q&A58Q&A No.: QAH8S-049Category: Power-Down StateSubject: Hardware Standby Mode at Power-OnQuestionHow can hardware st

Microcomputer Technical Q&A59Q&A No.: QAH8S-050Category: Power-Down StateSubject: Module Stop ModeQuestionWhen a write is performed on an 8-bi

Microcomputer Technical Q&A60Q&A No.: QAH8S-051Category: Power-Down StateSubject: Timer Output in Module Stop ModeQuestionIf module stop mode

Microcomputer Technical Q&A61Q&A No.: QAH8S-052Category: Electrical CharacteristicsSubject: Current Dissipation ValueQuestionIn the current di

iiiOn-Chip I/ODMACSubject: Number of States between Transfers... 71Subject:

Microcomputer Technical Q&A62Q&A No.: QAH8S-053Category: Electrical CharacteristicsSubject: RD Signal TimingQuestionWith successive read cycle

Microcomputer Technical Q&A63Applicable ProductsApplicability Series Applicability Series Applicability SeriesYes Entire H8S Series H8S/2655 H8S/2

Microcomputer Technical Q&A64Q&A No.: QAH8S-054Category: PinsSubject: Handling of Unused PinsQuestionHow should unused pins be handled?AnswerF

Microcomputer Technical Q&A65Q&A No.: QAH8S-055Category: PinsSubject: RES Pin, STBY Pin, and NMI Pin Input CircuitsQuestionWhat kind of circui

Microcomputer Technical Q&A66Q&A No.: QAH8S-056Category: PinsSubject: Address Pin States in On-Chip Memory AccessQuestionWhen on-chip ROM or o

Microcomputer Technical Q&A67Applicable ProductsApplicability Series Applicability Series Applicability SeriesYes Entire H8S Series H8S/2655 H8S/2

Microcomputer Technical Q&A68Q&A No.: QAH8S-057Category: PinsSubject: Built-In MOS Pull-Ups in ResetQuestionCan built-in MOS pull-ups be turne

Microcomputer Technical Q&A69Q&A No.: QAH8S-058Category: PinsSubject: WDTOVF PinQuestions1. What is the state of the WDTOVF pin in hardware st

Microcomputer Technical Q&A70Applicable ProductsApplicability Series Applicability Series Applicability SeriesEntire H8S Series Yes H8S/2655 Yes H

Microcomputer Technical Q&A71Q&A No.: QAH8S-201Category: DMACSubject: Number of States between TransfersQuestionA minimum of two states are ne

ivSubject: RDRF Flag Set Timing ... 110Subject: Interru

Microcomputer Technical Q&A72Q&A No.: QAH8S-202Category: DMACSubject: Maximum Transfer RateQuestionWhat is the maximum transfer rate for singl

Microcomputer Technical Q&A73Q&A No.: QAH8S-203Category: DMACSubject: Difference between DMAC and DTCQuestionWhat is the difference between th

Microcomputer Technical Q&A74Q&A No.: QAH8S-204Category: DMACSubject: Alternate 8-Bit/16-Bit Space AccessesQuestionCan data transfer be perfor

Microcomputer Technical Q&A75Applicable ProductsApplicability Series Applicability Series Applicability SeriesEntire H8S Series Yes H8S/2655 Yes H

Microcomputer Technical Q&A76Q&A No.: QAH8S-205Category: DMACSubject: TEND Signal Output Conditions when Using Write BufferFunctionQuestionWha

Microcomputer Technical Q&A77Internal addressExternal addressCPU external writeCPU external writeDMAC transferDMAC transferφLow in read/write cycl

Microcomputer Technical Q&A78Q&A No.: QAH8S-206Category: DMACSubject: Interrupt Acceptance After End of TransferQuestionAfter the transfer cou

Microcomputer Technical Q&A79Q&A No.: QAH8S-207Category: DMACSubject: Handling of Transfer Request before Start of TransferQuestionIf a transf

Microcomputer Technical Q&A80Q&A No.: QAH8S-208Category: DMACSubject: Activation Request Signal DetectionQuestionWhen the DREQ pin is designat

Microcomputer Technical Q&A81Applicable ProductsApplicability Series Applicability Series Applicability SeriesEntire H8S Series Yes H8S/2655 Yes H

1Microcomputer Technical Q&AQ&A No.: QAH8S-001Category: CPUSubject: Use of General RegistersQuestionIs it possible to use a mix of 8-bit, 16-b

Microcomputer Technical Q&A82Q&A No.: QAH8S-209Category: DMACSubject: Short Address Mode and Full Address ModeQuestionWhat is the difference b

Microcomputer Technical Q&A83Q&A No.: QAH8S-210Category: DMACSubject: Bus Right in Standby StateQuestionIn the DMAC full address mode and exte

Microcomputer Technical Q&A84Q&A No.: QAH8S-211Category: DMACSubject: Handling of Transfer End InterruptQuestionsThe manual states that if DTE

Microcomputer Technical Q&A85Applicable ProductsApplicability Series Applicability Series Applicability SeriesEntire H8S Series Yes H8S/2655 Yes H

Microcomputer Technical Q&A86Q&A No.: QAH8S-212Category: DMACSubject: DREQ Signal InputQuestionWhen the DREQ pin is used in level-sensing mode

Microcomputer Technical Q&A87Q&A No.: QAH8S-213Category: DTCSubject: Nature of DTCQuestionIs the DTC special hardware, or is the DTC function

Microcomputer Technical Q&A88Q&A No.: QAH8S-214Category: DTCSubject: Maximum Number of ChannelsQuestionWhat is the maximum number of DTC chann

Microcomputer Technical Q&A89Q&A No.: QAH8S-215Category: DTCSubject: Setting Register InformationQuestionAre any precautions necessary when se

Microcomputer Technical Q&A90Q&A No.: QAH8S-216Category: DTCSubject: Order of Setting Register InformationQuestionIs there a particular order

Microcomputer Technical Q&A91Q&A No.: QAH8S-217Category: DTCSubject: Use of DTC Interrupt Select Bit (DISEL)QuestionHow is the DISEL bit in DT