UPD75518 NEC, UPD75518 Datasheet - Page 85

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

P02/SO/SB0
P03/SI/SB1
P01/SCK0
output latch
P01
Selec-
tor
Selec-
tor
CSIM0
8/4
Bit
test
Fig. 4-34 Block diagram of the Serial Interface (Channel 0)
8
8
Internal bus
Slave address register (SVA)
Address comparator
Shift register (SIO0)
Bus release/
command/
acknowledge
detection circuit
Serial clock
control circuit
Serial clock
counter
8
Match signal
(8)
(8)
RELD
CMDD
ACKD
(8)
Bit manipulation
INTCSI0
control circuit
SET CLR
D
RELT
Q
CMDT
SO0 latch
Busy/
acknowledge
output circuit
MPX
SBIC
Bit test
External SCK0
f
f
f
TOUT F/F
(from timer/event counter)
X
X
X
set signal
IRQCSI0
/2
/2
/2
INTCSI0
3
4
6