M30622ECTFP datasheet(71/184 Pages) MITSUBISHI

71 / 184 page

Tentative Specifications REV.A

Mitsubishi microcomputers

M16C / 62T Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Specifications in this manual are tentative and subject to change.

Under

development

Watchdog Timer

Watchdog timer control register

Symbol

Address

When reset

WDC

000F16

00VXXXXX2

Function

Bit symbol

High-order bit of watchdog timer

WDC7

Bit name

Prescaler select bit

0 : Divided by 16

1 : Divided by 128

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.

Reserved bit

Must always be set to “0”

WDV5

0 : Cold start

1 : Warm start

Note 1: When this flag is written ‘‘0’’ or ‘‘1’’, it is set ‘‘1’’ automatically .

V : This bit is not under the influence of a reset.

Cold start / warm start

discrimination flag (Note 1)

Figure 1.15.2. Watchdog timer control and start registers

Cold start / Warm start

The cold start/warm start discrimination flag(bit 5 at 000F16) indicates the last reset by power on(cold start)

or by reset signal(warm start).

The cold start/warm start discrimination flag is set ‘‘0’’ at power on, and is set ‘‘1’’ at writing any data to the

watchdog timer control register(address is 000F16). The flag is not set to ‘‘0’’ by the software reset and the

input of reset signal.

Figure 1.15.3. Cold sgtart / Warm start

Vcc

‘‘5V’’

‘‘0V’’

‘‘5V’’

‘‘1’’

‘‘0’’

Cold start / Warm start

discrimination flag (WDC5)

RESET

0.2Vcc

Set to ‘‘1’’ by software

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