UPD75068CUA データシートの表示（PDF） - NEC => Renesas Technology

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UPD75068CUA

4-BIT SINGLE-CHIP MICROCOMPUTER

NEC => Renesas Technology 

µPD75064, 75066, 75068, 75064(A), 75066(A), 75068(A)

5.7 Serial Interface

(1) Serial interface function

The µPD75068 contains a clock synchronous 8-bit serial interface, which has four modes.

• Operation halt mode

• 3-wire serial I/O mode

• 2-wire serial I/O mode

• SBI (serial bus interface mode)

P03/SI/SB1

P02/SO/SB0

P01/SCK

Figure 5-6. Block Diagram of Serial Interface

Internal bus

8/4

Bit

8

Bit manipulation

Bit

test

8

8

test

Slave address

CSIM

register (SVA) (8)

SBIC

Match

signal

Address comparator

(8)

RELT

CMDT

Shift register (SIO)

SO

SET CLR latch

D

Q

(8)

P01

output

latch

Bus release/

command/

acknowledge

detection circuit

RELD

CMDD

ACKD

Busy/

acknowledge

output circuit

Serial clock

counter

INTCSI

control circuit

INTCSI

IRQCSI

set signal

Serial clock

control circuit

Serial clock

selector

fx/23

fx/24

fx/26

TOUT F/F

(from timer/

event counter)

External SCK

24

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