UPD75518 NEC, UPD75518 Datasheet - Page 86

• Manufacturer Part Number: UPD75518
• Description: 4 BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC

86
4.8.3 Register Functions
(1) Serial operation mode register 0 (CSIM0)
Address
FE0H
Fig. 4-35 shows the format of serial operation mode register 0 (CSIM0).
CSIM0 is an 8-bit register which specifies a serial interface (channel 0) operation mode, serial clock, wake-
up function, and so forth.
CSIM0 is manipulated using an 8-bit memory manipulation instruction. The higher three bits can be
manipulated bit by bit. Each bit can be manipulated using its name.
Each bit may or may not allow read and/or write operation. (See Fig. 4-35.) Bit 6 allows bit test operation
only; any data written to this bit is invalid.
When the RESET signal is input, this register is set to 00H.
Remark
CSIE0
7
(R) : Read only
(W) : Write only
Fig. 4-35 Format of Serial Operation Mode Register 0 (CSIM0) (1/3)
COI
6
WUP
5
CSIM04 CSIM03
4
Serial interface operation enable/disable specification bit (W)
3
CSIM02
Signal from address comparator (R)
2
CSIM01
Wake-up function specification bit (W)
1
CSIM00
Serial interface operation mode selection bit (W)
0
Serial clock selection bit (W)
Symbol
CSIM0
PD75518(A)