M30222 Datasheet, PDF (57/237 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

deUvnedloepr ^ment
MITSUBISHI MICROCOMPUTERS
Specifications in this manual are tentative and subject to change
M30222 Group
Rev. G
Watchdog Timer
SINGLE-CHIP16-BIT CMOS MICROCOMPUTER
Watchdog timer control register (Note)
b7 b6 b5 b4 b3 b2 b1 b0
00
Symbol
WDC
Address
000F16
When reset
000XXXXX 2
Bit symbol
Bit name
High-order bit of Watchdog timer
Function
Reserved bit
Must always be set to “0”
WDC7
Prescaler select bit
0 : Divided by 16
1 : Divided by 128
Note: Set the desired prescale value before initializing the Watchdog timer.
Watchdog timer start register
b7
b0
Symbol
Address
When reset
WDTS
000E16 Indeterminate
RW
Function
The Watchdog timer is initialized and starts counting after the first write instruction
to this register after reset. Writing any value to this register resets the counter to
7FFF16.
RW
Fig. 1.38. Watchdog timer control and start registers
1-58