NEC PD78078 用户手册
461
CHAPTER 20 SERIAL INTERFACE CHANNEL 2
20.3 Serial Interface Channel 2 Control Registers
Serial interface channel 2 is controlled by the following four registers.
• Serial Operating Mode Register 2 (CSIM2)
• Asynchronous Serial Interface Mode Register (ASIM)
• Asynchronous Serial Interface Status Register (ASIS)
• Baud Rate Generator Control Register (BRGC)
(1) Serial operating mode register 2 (CSIM2)
This register is set when serial interface channel 2 is used in the 3-wire serial I/O mode.
CSIM2 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets CSIM2 to 00H.
Figure 20-3. Serial Operating Mode Register 2 Format
Cautions 1. Ensure that bits 0 and 3 to 6 are set to 0.
2. When UART mode is selected, CSIM2 should be set to 00H.
6
5
4
3
2
1
0
<7>
Symbol
CSIM2 CSIE2
0
0
0
0
CSIM
22
CSCK
0
FF72H 00H R/W
Address After Reset R/W
CSCK
0
1
Clock Selection in 3-wire Serial I/O Mode
Input clock from off-chip to SCK2 pin
Dedicated baud rate generator output
CSIM22
0
1
First Bit Specification
MSB
LSB
CSIE2
0
1
Operation Control in 3-wire Serial I/O Mode
Operation stopped
Operation enabled