uPD789871 Subseries 8-Bit Single-Chip Microcontrollers PUM
uPD789871 Subseries 8-Bit Single-Chip Microcontrollers PUM
uPD789871 Subseries 8-Bit Single-Chip Microcontrollers PUM
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100<br />
(1) Operation stop mode<br />
CHAPTER 10 SERIAL INTERFACE 10<br />
Table 10-2. Settings of Serial Interface 10 Operation Mode<br />
CSIM10 PM22 P22 PM21 P21 PM20 P20 Start Shift P22/SI10 P21/SO10 P20/SCK10<br />
CSIE10 DIR10 CSCK10 <strong>Bit</strong> Clock Pin Function Pin Function Pin Function<br />
0 × × × Note 1 × Note 1 × Note 1 × Note 1 × Note 1 × Note 1 – – P22 P21 P20<br />
Other than above Setting prohibited<br />
(2) 3-wire serial I/O mode<br />
CSIM10 PM22 P22 PM21 P21 PM20 P20 Start Shift P22/SI10 P21/SO10 P20/SCK10<br />
CSIE10 DIR10 CSCK10 <strong>Bit</strong> Clock Pin Function Pin Function Pin Function<br />
1 0 0 1 Note 2 × Note 2 0 1 1 × MSB External SI10 Note 2 SO10 SCK10 input<br />
Preliminary User’s Manual U14938EJ1V0UM<br />
clock (CMOS output)<br />
1 0 1 External SCK10 output<br />
1 1 0 1 × LSB External SCK10 input<br />
1 0 1 External<br />
clock<br />
SCK10 output<br />
clock<br />
clock<br />
Other than above Setting prohibited<br />
Notes 1. Can be used as port function.<br />
2. If used only for transmission, can be used as P22 (CMOS I/O port).<br />
Remark ×: don’t care
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