CHAPTER 11 SERIAL INTERFACE 20
User’s Manual U15331EJ4V1UD
215
Figure 11-11. 3-Wire Serial I/O Mode Timing (2/2)
(ii) Slave operation timing (CSCK20=1)
1
2
3
4
5
6
7
8
DI7
DI6
DI5
DI4
DI3
DI2
DI1
DI0
DO7
DO6
DO5
DO4
DO3
DO2
DO1
DO0
SCK20
SI20
Note
SO20
SIO20
write
INTCSI20
Note
The value of the last bit previously output is output.
(3) Transfer
start
Serial transfer is started by setting transfer data to transmit shift register 20 (TXS20/SIO20) when the
following two conditions are satisfied.
•
Bit 7 (CSIE20) of serial operation mode register 20 (CSIM20) = 1
•
Internal serial clock is stopped or SCK20 is high after 8-bit serial transfer.
Caution If CSIE20 is set to “1” after data is written to TXS20/SIO20, transfer does not start.
Termination of 8-bit transfer stops the serial transfer automatically and generates the interrupt request signal
(INTCSI20).
Содержание PD789488
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