NEC 3. Be sure to set WUP to 0 when the 3-wire serial I/O mode is selected.

301
CHAPTER 16 SERIAL INTERFACE CHANNEL 0 ( µ PD78058F SUBSERIES)
65432107
Symbol
CSIM0
CSIM01
0
1
Serial Interface Channel 0 Clock Selection
Input Clock to SCK0 pin from off-chip
8-bit timer register 2 (TM2) output
0
SBI mode (see section 16.4.3 SBI mode operation.)
R/W
1 Clock specified with bits 0 to 3 of timer clock select register 3 (TCL3)
CSIM
04
0
CSIM00
×
0
1
FF60H 00H R/W
Note 1
Address After Reset R/W
R/W
CSIM
03
CSIM
02 PM25 P25 PM26 P26 PM27 P27
Operation
Mode Start Bit SIO/SB0/P25 Pin Function
SO0/SB1/P26
Pin Function
SCK0/P27
Pin Function
×
10
WUP
0
1
Wake-up Function Control
Note 3
Interrupt request signal generation with each serial transfer in any mode
Interrupt request signal generation when the address received after bus release
(when CMDD=RELD=1) matches the slave address register (SVA) data in SBI mode
R/W
1
MSB
LSB
1×0001
Note 2
3-wire serial
l/O mode SI0 (Input) SO0 (CMOS output) SCK0 (CMOS input/output)
2-wire serial I/O mode (see section 16.4.4 2-wire serial I/O mode operation.)
11
Note 2 Note 2
CSIE0
0
Serial Interface Channel 0 Operation Control
Operation stopped
Operation enabled
R/W
1
CSIE0 COI WUP CSIM04 CSIM03 CSIM02 CSIM01 CSIM00
Notes 1. Bit 6 (COI) is a read-only bit.
2. Can be used as P25 (CMOS input/output) when used only for transmission.
3. Be sure to set WUP to 0 when the 3-wire serial I/O mode is selected.
Remark ×: don’t care
PMXX: Port Mode Register
PXX : Port Output Latch