M16CSLASH26 datasheet(71/239 Pages) RENESAS

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Watchdog Timer

Renesas Technology Corp.

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

Note 1: The WDC5 bit is set to 0 immediately after power-on (cold start).

Watchdog timer start register

Symbol

Address

When reset

WDTS

000E16

Indeterminate

Function

The watchdog timer is initialized and starts counting after a write instruction to

this register. The watchdog timer value is always initialized to 7FFF16

regardless of whatever value is written.

Watchdog timer control register

Symbol

Address

After reset

WDC

000F16 00?XXXXX 2(Note1)

Function

Bit symbol

High-order bit of watchdog timer

WDC7

Bit name

Prescaler select bit

0 : Divided by 16

1 : Divided by 128

Reserved bit

Set to 0

Cold start / warm start

discrimination flag (Note 2)

0 : Cold start

1 : Warm start

WDC5

Note 2: The WDC5 bit will always be set to a 1 whenever the WDC SFR is written (regardless of value of WDC5 bit).

Figure 1.10.2. Watchdog timer control and start registers

BCLK

Write to the watchdog timer

start register

(address 000E16)

RESET

PM12 = 0

Watchdog timer

Set to

7FFF16

1/128

1/16

CM07 = 0

WDC7 = 1

CM07 = 0

WDC7 = 0

CM07 = 1

HOLD

1/2

Prescaler

PM12 = 1

Watchdog timer

interrupt request

Reset

Figure 1.10.1. Block diagram of watchdog timer

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