UPD75238GJ

Manufacturer Part NumberUPD75238GJ
Description4 BIT SINGLE-CHIP MICROCOMPUTER
ManufacturerNEC [NEC]
UPD75238GJ datasheet
 
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Page 82/190

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(3) Functions of serial interface (channel 0) registers
(a) Serial operation mode register 0 (CSIM0)
Fig. 4-40 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. 4-40.) Bit 6 allows bit test
operation only; any data written to this bit is invalid.
A RESET input clears all bits to 0.
Fig. 4-40 Format of Serial Operation Mode Register 0 (CSIM0) (1/3)
Address
7
6
5
FE0H
CSIE0
COI
WUP
CSIM04 CSIM03
Remark (R) : Read only
(W) : Write only
82
4
3
2
1
0
CSIM02
CSIM01
CSIM00
Serial clock selection bit (W)
Serial interface operation mode selection bit (W)
Wake-up function specification bit (W)
Signal from address comparator (R)
Serial interface operation enable/disable specification bit (W)
PD75238
Symbol
CSIM0