M16C62A Datasheet, PDF (58/242 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Watchdog Timer
BCLK
Write to the watchdog timer
start register
(address 000E16)
RESET
Prescaler
1/16
“CM07 = 0”
“WDC7 = 0”
1/128
“CM07 = 0”
“WDC7 = 1”
“CM07 = 1”
1/2
Figure 1.11.1. Block diagram of watchdog timer
Mitsubishi microcomputers
M16C / 62A Group (80-pin)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Watchdog timer
Set to
“7FFF16”
Watchdog timer
interrupt request
Watchdog timer control register
b7 b6 b5 b4 b3 b2 b1 b0
00
Symbol
WDC
Address
000F16
Bit symbol
Bit name
High-order bit of watchdog timer
Reserved bit
Reserved bit
WDC7
Prescaler select bit
When reset
000XXXXX2
Function
Must always be set to “0”
Must always be set to “0”
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”
regardless of whatever value is written.
Figure 1.11.2. Watchdog timer control and start registers
57