UPD78F9418A NEC, UPD78F9418A Datasheet - Page 176

• Manufacturer Part Number: UPD78F9418A
• Description: (UPD7894xxA) 8-Bit Single Chip Microcontrollers
• Manufacturer: NEC

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13.3 Registers Controlling Serial Interface 00
176
The following four registers are used to control serial interface 00.
• Serial operation mode register 00 (CSIM00)
• Asynchronous serial interface mode register 00 (ASIM00)
• Asynchronous serial interface status register 00 (ASIS00)
• Baud rate generator control register 00 (BRGC00)
(1)
Cautions 1. Bits 0 and 3 to 6 must be fixed to 0.
CSIM00
Symbol
Serial operation mode register 00 (CSIM00)
This register is set when using serial interface 00 in the 3-wire serial I/O mode.
CSIM00 is set using a 1-bit or 8-bit memory manipulation instruction.
RESET input sets CSIM00 to 00H.
2. Set CSIM00 to 00H in the UART mode.
CSIE00
CSIE00
CSCK00
DIR00
<7>
0
1
0
1
0
1
Operation stopped
Operation enabled
MSB
LSB
Clock input to SCK pin from external
Dedicated baud rate generator output
6
0
Figure 13-3. Format of Serial Operation Mode Register 00
5
0
4
0
CHAPTER 13 SERIAL INTERFACE 00
3
0
User’s Manual U13952EJ3V0UD
DIR00 CSCK00
Operation control in 3-wire serial I/O mode
Clock selection in 3-wire serial I/O mode
2
1
Start bit specification
0
0
Address
FF72H
After reset
00H
R/W
R/W