3822_03 Datasheet, PDF (176/328 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
2.5 Serial I/O
sTransmit/receive timing example in the clock synchronous mode
Figure 2.5.7 shows a data transmit/receive timing example in the clock synchronous mode.
3822 Œ
TXD
RXD
SCLK
3822 
TXD
RXD
SCLK
Transmit enable bit
Transmit buffer
empty flag
Transmit shift
register shift
completion flag
Write “1”
Write transmit data to transmit buffer register
Write next transmit data
Shift clock
TXD
D0 D1 D2 D3 D4 D5 D6 D7 D0 D1
Receive enable bit
Write “1”
Receive buffer full
flag
Read out receive buffer register
RXD
D0 D1 D2 D3 D4 D5 D6 D7 D0 D1
Fig. 2.5.7 Transmit/receive timing example in clock synchronous mode
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3822 GROUP USER’S MANUAL