M32C8A Datasheet, PDF (136/372 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M32C/80 Series

M32C/8A Group
12. Watchdog Timer
Watchdog Timer Control Register
b7 b6 b5 b4 b3 b2 b1 b0
0
Symbol
WDC
Address
000Fh
Bit Symbol
Bit Name
Function
−
(b4-b0)
WDC5
−
(b6)
WDC7
High-order bits of watchdog timer
Cold start/warm start determine
flag⁽¹⁾
0: Cold start
1: Warm start
Reserved bit
Set to 0
Prescaler select bit
0: Divide-by-16
1: Divide-by-128
After Reset
00XX XXXXb
RW
RO
RW
RW
RW
NOTES:
1. The WDC5 bit is 0 after power-on. It can be set to 1 only by program. The bit becomes 1 by writing either a 0 or 1.
The bit maintains a value set before reset, even after reset has been performed.
Watchdog Timer Start Register
b7
b0
Symbol
WDTS
Address
000Eh
Address
Undefined
Function
RW
The counter is initialized and starts decrementing by a write instruction to the WDTS register.
7FFFh is the default value after initialization no matter what value is written.
WO
Figure 12.3 WDC Register, WDTS Register
Rev.1.00 Jul 15, 2007 Page 119 of 352
REJ09B0385-0100