
M306V5ME-XXXSP
M306V5EESP
MITSUBISHI MICROCOMPUTERS
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
57
Rev. 1.0
Figure 2.8.3 Watchdog timer start register
Watchdog timer start register
Symbol
WDTS
Address
000E
16
When reset
Indeterminate
W
R
b7
b0
Function
The watchdog timer is initialized and starts counting after a write instruction to
this register. The watchdog timer value is always initialized to “7FFF
16
”
regardless of whatever value is written.
Figure 2.8.1 Block diagram of watchdog timer
Figure 2.8.2 Watchdog timer control register
Watchdog timer control register
Symbol
WDC
Address
000F
16
When reset
000
2
Function
Bit symbol
W
R
b7
b6
0
b5
0
b4
b3
b2
b1
b0
High-order bit of watchdog timer
WDC7
Bit name
Prescaler select bit
0 : Divided by 16
1 : Divided by 128
Reserved bits
Must always be set to “0”
BCLK
Write to the watchdog timer
start register
(address 000E
16
)
RESET
Watchdog timer
interrupt request
Watchdog timer
Set to
“7FFF
16
”
1/16
“WDC7 = 0”
“WDC7 = 1”
HOLD
1/128
Prescaler