Renesas Asynchronous SH7145F Application Note page 7

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