UPD75238GJ NEC [NEC], UPD75238GJ Datasheet - Page 109

• Manufacturer Part Number: UPD75238GJ
• Description: 4 BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC [NEC]

P81/SCK1
P82/SO1
P83/SI1
bit 0
Shift register 1 (8)
Fig. 4-59 Block Diagram of the Serial Interface (Channel 1)
8
SIO1 write signal (serial start signal)
Q
Serial clock
counter (3)
7
R
S
Clear
SIO1
Internal bus
Overflow
bit 7
Serial operation mode register (8)
Bit
manipulation
8
Serial clock
selector
0
Clear
Set
CSIM1
Serial transfer
end flag (EOT)
Bit manipulation
f
f
X
X
/2
/2
3
4