PD17012_15 Datasheet, PDF (178/320 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE

µPD17012, 17P012
Figure 15-4. Example of Wait Operation
Shift ^H
clock pin _L
Serial data ^H
input pin _L
Serial data ^H _{Previous value}
output pin _L
Clock
counter
0
1
2
3
d7
d6
d5
D7
D6
D5
1
2
3
7
8
d1
d0
D1
D0
7
80
1
SIO1TS
0
Wait status
Wait released status
Wait status
Wait released
Wait
When the wait is released, the serial data is output at the next falling edge of the clock, and the status becomes
the wait released status.
When the shift clock has been input eight times, the shift clock pin outputs a high level, and the clock counter
and presettable shift register stop operation.
If data is written to or read from the presettable shift register while the wait status is released and the shift
clock pin is high, the correct data may not be set or read.
If data is written to the presettable shift register while the wait status is released and the shift clock pin is
low, the contents of the MSB are output to the serial data output pin as soon as the PUT instruction has been
executed.
If a forced wait is executed while the wait status is released, the wait status is set and the clock counter is
reset to 0 as soon as “0” has been written to the SIO1TS flag.
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Data Sheet U10101EJ4V0DS