CHAPTER 9 SERIAL INTERFACE 00
User's Manual U11919EJ3V0UM00
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9.4 Serial Interface 00 Operation
Serial interface 00 provides the following three types of modes.
•
Operation stop mode
•
Asynchronous serial interface (UART) mode
•
3-wire serial I/O mode
9.4.1 Operation stop mode
In the operation stop mode, serial transfer is not executed, therefore, the power consumption can be reduced.
The P20/SCK0/ASCK, P21/SO0/TxD, and P22/SI0/RxD pins can be used as normal I/O ports.
(1)
Register setting
Operation stop mode is set by serial operation mode register 00 (CSIM00) and asynchronous serial
interface mode register 00 (ASIM00).
(a) Serial operation mode register 00 (CSIM00)
CSIM00 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input clears CSIM00 to 00H.
CSIE00
0
1
Operation Control in 3-Wire Serial I/O Mode
CSIE00
0
0
0
0
DIR00
CSCK00
0
CSIM00
Symbol
Address
After Reset
R/W
FF72H
00H
R/W
<7>
6
5
4
3
2
1
0
Operation stop
Operation enable
Caution
Be sure to set bit 0 and bits 3 to 6 to 0.
Summary of Contents for mPD789026 Subseries
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