UPD754264 datasheet(21/69 Pages) RENESAS

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µPD754264

Data Sheet U12487EJ1V2DS

7.3 Basic Interval Timer/Watchdog Timer

The basic interval timer/watchdog timer has the following functions.

(a)

Interval timer operation to generate a reference time interrupt

(b)

Watchdog timer operation to detect a runaway of program and reset the CPU

(c)

Selects and counts the wait time when the standby mode is released

(d)

Reads the contents of counting

Figure 7-2. Basic Interval Timer/Watchdog Timer Block Diagram

Notes 1. The wait time can be specified when the standby mode is released.

2. Instruction execution.

From clock

generator

fX/25

fX/27

fX/29

fX/212

MPX

BTM3 BTM2 BTM1 BTM0 BTM

SET1Note 2

Internal bus

Basic interval timer

(8-bit frequency divider)

Clear

Wait release signal

when standby is

releasedNote 1.

Set

Clear

WDTM

SET1Note 2

Internal reset

signal

Vectored

interrupt

request signal

interrupt

request flag

IRQBT

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