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SH7145F
Asynchronous Serial Data Transmission/Reception
REJ06B0357-0100O/Rev.1.00 March 2004 Page 13 of 17
(3) Data Receive Routine
No
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
No
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()