UPD17145 datasheet(51/102 Pages) NEC

Part #	UPD17145

Description	SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS

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Manufacturer	NEC [NEC]

Direct Link	http://www.nec.com/

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51 / 102 page

51

µPD17145(A1), 17147(A1), 17149(A1)

Figure 15-1. Block Diagram of Serial Interface

Caution

The output latch of the shift register is independent of the output latch of P0D1. Therefore,

even if an output instruction is executed to P0D1, the status of the output latch of the shift

register is not affected. The output latch of the shift register is cleared to “0” by RESET

input. After that, it holds the status of the LSB of the previously transferred data.

P0D2/SI

P0D1/SO

P0D0/SCK

Shift register (SIOSFR)

P0D1

output latch

Serial clock

counter

Clear

Selector

SIOTS

SIOHIZ

SIOCK1

SIOCK0

IRQSIO

clear signal

IRQSIO

set signal

One shot

SIOEN

P0DBIO0

P0DBIO1

Q

S

R

Output

latch

LSB

MSB

Clock

Carry

P0D0

output latch

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UPD17145 Datasheet(PDF) 51 Page - NEC

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