M16CSLASH1N datasheet(81/238 Pages) RENESAS

81 / 238 page

Rev.1.00

Oct 20, 2004

page 69 of 222

M16C/1N Group

11. Watchdog Timer

REJ09B0007-0100Z

b5 b4

Watchdog timer control register

Symbol

WDC

Address

000F16

When reset

000XXXXX2

Function

Bit name

Bit symbol

High-order bit of watchdog timer

Reserved bit

WDC7

Set to "0"

0 : Divided by 16

1 : Divided by 128

Prescaler select bit

Watchdog timer start register

Symbol

WDTS

Address

000E16

When reset

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.

b5 b4

PM12

WDT interrupt/reset

switching bit

DATAROM area access

bit (Note 2)

Nothing is assigned.

In an attempt to write to this bit, write "0". The value, if read, turns out to be

indeterminate.

Nothing is assigned.

In an attempt to write to these bits, write "0". The value, if read, turns out to be

indeterminate.

0 : Watchdog timer interrupt

1 : Reset (Note 3)

Processor mode register 1 (Note 1)

Note 1: Set bit 1 of the protect register (address 000A16) to "1" when writing new values to this register.

Note 2: This bit is valid for the flash memory version. For the mask ROM version, this bit must be set to "0".

Note 3: After setting this bit to "1", can not change to "0" by software.

PM17

Wait bit

0 : No wait

1 : Wait

0 : Disabled

1 : Enabled

PM10

Reserved bit

Set to "0"

Symbol

PM1

Address

000516

When reset

00XXX0X02

Function

Bit name

Bit symbol

Figure 11.2 Watchdog timer control and start registers

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