UPD750008A データシートの表示（PDF） - NEC => Renesas Technology

部品番号

コンポーネント説明

メーカー

UPD750008A

4 BIT SINGLE-CHIP MICROCONTROLLER

NEC => Renesas Technology 

µPD750004, 750006, 750008, 750004(A), 750006(A), 750008(A)

6.5 BASIC INTERVAL TIMER/WATCHDOG TIMER

The basic interval timer/watchdog timer has these functions:

• Interval timer operation which generates a reference timer interrupt

• Operation as a watchdog timer for detecting program crashes and resetting the CPU

• Selection of wait time for releasing the standby mode and counting the wait time

• Reading out the count value

Fig. 6-4 Block Diagram of the Basic Interval Timer/Watchdog Timer

From the clock

generator

fX /25

fX /27

fX /29

fX /212

MPX

Clear signal

Basic interval timer

(8-bit frequency divider)

BT

Clear signal

Set

signal

BT interrupt

request flag

IRQBT

Vectored

interrupt

request

signal

3

BTM3 BTM2 BTM1 BTM0 BTM

SET1Note

4

8

Internal bus

Wait release

signal for standby

release

WDTM

1

SET1Note

Internal

reset signal

Note Instruction execution

25

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