SH7708 datasheet(195/633 Pages) RENESAS

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177

9.8

Overview of the Watchdog Timer (WDT)

9.8.1

Block Diagram of the WDT

Figure 9.4 shows a block diagram of the WDT.

WTCSR

Standby

control

Bus interface

WTCNT

Divider

Clock selector

Clock

Internal bus

Standby

mode

Peripheral

clock

Standby

cancellation

Reset

control

Clock selection

WDT

Overflow

Internal

reset

request

Interrupt

control

Interrupt

request

WTCSR:

WTCNT:

Watchdog timer control/status register

Watchdog timer counter

Figure 9.4 Block Diagram of the WDT

9.8.2

The WDT has two registers that select the clock, switch the timer mode, and perform other

functions. Table 9.5 shows the WDT register.

Table 9.5

Name

Abbreviation

R/W

Size

Initial Value

Address

Watchdog timer counter

WTCNT

R/W*

R: byte;

W: word*

H'00

H'FFFFFF84

Watchdog timer

control/status register

WTCSR

R/W*

R: byte;

W: word*

H'00

H'FFFFFF86

Note: * Write with a word access. Write H'5A and H'A5, respectively, in the upper bytes. Byte or

longword writes are not possible. Read with a byte access.

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