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SH7145F
Asynchronous Serial Data Transmission/Reception
REJ06B0357-0100O/Rev.1.00 March 2004 Page 7 of 17
Table 3 Processing
Software Processing Hardware Processing
(1) — RSR_1 receives serial data and transfers it
to RDR_1
(2) — Set RDRF flag in SSR_1 to 1
(3) Read data from RDR_1
(4) Clear RDRF flag in SSR_1 to 0
(5) WritereceivedatatoTDR_1 —
(6) Clear TDRE flag in SSR_1 to 1 —
(7) — TransferdatafromTDR_1toTSR_1
(8) — Set TDRE flag in SSR_1 to 1 and output
transmit data from pin TXD1
(9) — RSR_1 receives serial data and transfers it
to RDR_1
(10) — Set RDRF flag in SSR_1 to 1
(11) Read data from RDR_1
(12) Clear RDRF flag in SSR_1 to 0
(13) Write receive data to TDR_1 —
(14) Clear TDRE flag in SSR_1 to 1 —
(15) — Transfer data from TDR_1 to TSR_1
(16) Repeat Repeat