UPD75238GJ NEC [NEC], UPD75238GJ Datasheet - Page 102

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

Master device processing (transmitter)
Transfer line
Slave device processing (receiver)
Program processing
Hardware operation
Program processing
Hardware operation
SCK0 pin
SB0 pin
Fig. 4-54 Address Transfer Operation from Master Device to Slave Device (WUP = 1)
Set
CMDT
Set
CMDD
Set
RELT
Clear
CMDD
Set
RELD
Set
CMDT
Set
CMDD
Write
to SIO0
1
A7
2
A6
3
A5
Serial receive operation
Serial send operation
4
Address
A4
5
A3
6
A2
7
A1
8
A0
(When SVA = SIO0)
9
Generate
IRQCSI0
Generate
IRQCSI0
Interrupt handling (preparation for next serial transfer)
WUP 0
Output
ACK
Set
ACKT
Output
BUSY
ACK
Set
ACKD
BUSY
Clear
BUSY
Clear
BUSY
READY
Stop
SCK0