Serial Interface 00 Control Register - NEC UPD789026 Series User Manual

9.3 Serial Interface 00 Control Register

The following four types of 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) 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 with a 1-bit or 8-bit memory manipulation instruction.
RESET input clears CSIM00 to 00H.
Symbol
CSIM00
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Cautions 1. Be sure to set bit 0 and bits 3 to 6 to 0.
CHAPTER 9 SERIAL INTERFACE 00
Figure 9-3. Serial Operation Mode Register 00 Format
<7> 6 5 4
CSIE00 0 0 0
CSIE00
0 Operation stop
1 Operation enable
DIR00
0 MSB
1 LSB
CSCK00
0 Input clock to SCK0 pin from external
1 Dedicated baud rate generator output
2. Set 00H to CSIM00 at the UART mode.
3 2 1 0
0 DIR00 CSCK00 0
Operation Control in 3-Wire Serial I/O Mode
Start Bit Specification
Clock Selection in 3-Wire Serial I/O Mode
User's Manual U11919EJ3V0UM00
Address After Reset R/W
FF72H 00H R/W
125