M16C1N Datasheet, PDF (81/238 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/10 SERIES

M16C/1N Group
11. Watchdog Timer
Watchdog timer control register
b7 b6 b5 b4 b3 b2 b1 b0
00
Symbol
WDC
Address
000F16
When reset
000XXXXX2
Bit symbol
Bit name
High-order bit of watchdog timer
Function
RW
RO
Reserved bit
Set to "0"
RW
WDC7
Prescaler select bit
0 : Divided by 16
1 : Divided by 128
RW
Watchdog timer start register
b7
b0
Symbol
WDTS
Address
000E16
When reset
Indeterminate
Function
RW
The watchdog timer is initialized and starts counting after a write instruction
to this register. The watchdog timer value is always initialized to "7FFF16" ^WO
regardless of whatever value is written.
Processor mode register 1 (Note 1)
b7 b6 b5 b4 b3 b2 b1 b0
0
Symbol
PM1
Address
000516
When reset
00XXX0X02
Bit symbol
Bit name
Function
RW
PM10
DATAROM area access
bit (Note 2)
0 : Disabled
1 : Enabled
RW
Nothing is assigned.
In an attempt to write to this bit, write "0". The value, if read, turns out to be
indeterminate.
PM12
WDT interrupt/reset
switching bit
0 : Watchdog timer interrupt
1 : Reset (Note 3)
RW
Nothing is assigned.
In an attempt to write to these bits, write "0". The value, if read, turns out to be
indeterminate.
Reserved bit
Set to "0"
RW
PM17
Wait bit
0 : No wait
1 : Wait
RW
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.
Figure 11.2 Watchdog timer control and start registers
Rev.1.00 Oct 20, 2004 page 69 of 222
REJ09B0007-0100Z