Renesas Asynchronous SH7145F User Manual download pdf (Page 13)

SH7145F

Asynchronous Serial Data Transmission/Reception

REJ06B0357-0100O/Rev.1.00 March 2004 Page 13 of 17

(3) Data Receive Routine

Yes

Read receive data from RDR_1 and

store it in on-chip RAM

Transmit receive data without

modification

Clear RDRF flag in SSR_1 to 0

Wait until

RDR_1 finishes receiving

data

RTE

rcv_sci()

(4) Data Transfer Routine

Yes

Write transmit data to TDR_1

Clear TDRE bit in SSR_1 to 0

Wait until

possible to write to

TDR_1

RTE

trans_sci()

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Renesas Asynchronous SH7145F User Manual Page 13