UPD75238GJ NEC [NEC], UPD75238GJ Datasheet - Page 82

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UPD75238GJ

Manufacturer Part Number
UPD75238GJ
Description
4 BIT SINGLE-CHIP MICROCOMPUTER
Manufacturer
NEC [NEC]
Datasheet
82
(3) Functions of serial interface (channel 0) registers
Address
FE0H
(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.
Remark (R) : Read only
CSIE0
7
(W) : Write only
Fig. 4-40 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
PD75238

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