HD64F3437TF16 Datasheet, PDF(251/752 Page) Hitachi Semiconductor – 12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.

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HD64F3437TF16 Datasheet, PDF (251/752 Pages) Hitachi Semiconductor – 12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.

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11.1.2 Block Diagram

Figure 11.1 is a block diagram of the watchdog timer.

Internal reset or NMI

(watchdog timer mode)

WOVF interrupt

request signal

(interval timer mode)

System

interrupt

control

RESO pin

TCNT: Timer counter

TCSR: Timer control/status register

Overflow

Clock

TCNT

TCSR

Read/write

control

Internal

data bus

Internal clock source

Clock

select

Ã¸P/2

Ã¸P/32

Ã¸P/64

Ã¸P/128

Ã¸P/256

Ã¸P/512

Ã¸P/2048

Ã¸P/4096

Figure 11.1 Block Diagram of Watchdog Timer

11.1.3 Output Pin

Table 11.1 Output Pin of Watchdog Timer

Name

Reset out output pin

Abbreviation

RESO

I/O

Output

Function

Counter overflow signal output in

watchdog timer mode

222

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