Serial Interface Channel 2 Control Registers; Serial Operating Mode Register 2 Format - NEC PD78081(A) User Manual

11.3 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.
Symbol
7 6
CSIM2 CSIE2 0
Cautions 1. Set 0 to the bits 0 and 3 to 6.
2. When UART mode is selected, CSIM2 should be set to 00H.
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CHAPTER 11 SERIAL INTERFACE CHANNEL 2
Figure 11-3. Serial Operating Mode Register 2 Format
5 4 3 2
CSIM
0 0 0
CSCK
22
1 0 Address After Reset
FF72H
0
CSCK Clock Selection in 3-wire Serial I/O Mode
0 Input clock from off-chip to SCK2 pin
1 Dedicated baud rate generator output
First Bit Specification
CSIM22
0 MSB
1 LSB
CSIE2 Operation Control in 3-wire Serial I/O Mode
0 Operation stopped
1 Operation enabled
R/W
00H R/W