Renesas EDK3687 Technical Information download pdf (Page 8)

4. EDK OPERATION

4.1. USER INTERFACE

The EDK provides two buttons for influencing the operation of the board. The purpose of each button is clearly marked next

to it. Refer to the board layout for positions (Section 3)

1. Reset Switch

This button provides the microcontroller with a reset pulse utilizing the built in power on reset control of the device.

2. NMI Switch

This button provides a de-bounced signal to the microcontroller for each operation of the button. There is no maximum

activation time for this button.

4.2. SERIAL INTERFACE

The serial port on the microcontroller directly supports three wire serial interfaces. Options are provided on the board for the

user to write handshaking routines using standard port pins.

4.2.1. CONNECTOR PIN DEFINITIONS

The EDK RS232 interface conforms to Data Communication Equipment (DCE) format allowing the use of 1-1 cables when

connected to Data Terminal Equipment (DTE) such as an IBM PC. The cable used to connect to the EDK will affect the

available board options. A fully wired cable can allow handshaking between the microcontroller and the host PC, subject to

setting the board options and the availability of suitable host software. Handshaking is not supported as standard on the

microcontroller so for normal use a minimal three-wire cable can be used. The minimum connections are unshaded in the

following table.

EDK DB9

Connector Pin

Signal Host DB9

Connector Pin

1 No Connection 1

2 EDK Tx Host Rx 2

3 EDK Rx Host Tx 3

4 No Connection 4

5 Ground 5

6 No Connection 6

7 EDK CTS Host RTS 7

8 EDK RTS Host CTS 8

9 No Connection 9

TABLE 4-1: RS232 INTERFACE CONNECTIONS

12345

6789

FIGURE 4-1: EDK SERIAL PORT PIN NUMBERING

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 17 18

No comments

Renesas EDK3687 Technical Information Page 8