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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10.3 Register Controlling Serial Interface 10<br />
CHAPTER 10 SERIAL INTERFACE 10<br />
The following register is used to control serial interface 10.<br />
• Serial operation mode register 10 (CSIM10)<br />
(1) Serial operation mode register 10 (CSIM10)<br />
This register is used to control serial interface 10 operation and set the serial clock and start bit.<br />
CSIM10 is set with a 1-bit or 8-bit memory manipulation instruction.<br />
RESET input clears CSIM10 to 00H.<br />
Figure 10-2. Serial Operation Mode Register 10 Format<br />
Symbol 6 5 4 3 2 1 0 Address After reset R/W<br />
CSIM10<br />
CSIE10 0 TPS101TPS100 0 DIR10 CSCK10 0<br />
CSIE10<br />
0<br />
1<br />
TPS101 TPS100<br />
0<br />
0<br />
1<br />
1<br />
DIR10<br />
0<br />
1<br />
CSCK10<br />
0<br />
1<br />
Operation stopped<br />
Operation enabled<br />
0<br />
1<br />
0<br />
1<br />
MSB<br />
LSB<br />
fX/2 2 (1.25 MHz)<br />
fX/2 3 (625 kHz)<br />
fX/2 4 (313 kHz)<br />
fX/2 5 (157 kHz)<br />
Input clock to SCK10 pin from external<br />
Caution <strong>Bit</strong>s 0, 3, and 6 must be set to 0.<br />
Operation control in 3-wire serial I/O mode<br />
FF72H 00H R/W<br />
Count clock selection during operation enable in 3-wire serial I/O mode<br />
Internal clock selected by TPS100, TPS101<br />
Start bit specification<br />
Clock selection in 3-wire serial I/O mode<br />
Remarks 1. fX: Main system clock oscillation frequency<br />
2. The parenthesized values apply to operation at fX = 50 MHz.<br />
Preliminary User’s Manual U14938EJ1V0UM 99
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