M306V2 Mitsubishi, M306V2 Datasheet - Page 68

• Manufacturer Part Number: M306V2
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
• Manufacturer: Mitsubishi

68
Figure 2.8.1 Block diagram of watchdog timer
Figure 2.8.2 Watchdog timer control register
Figure 2.8.3 Watchdog timer start register
Write to the watchdog timer
start register
(address 000E
b7
Watchdog timer start register
RESET
Watchdog timer control register
HOLD
b7
BCLK
b6
0
16
)
b5
0
b4
b3
b2
b1
b0
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
The watchdog timer is initialized and starts counting after a write instruction to
this register. The watchdog timer value is always initialized to “7FFF
regardless of whatever value is written.
b0
Bit symbol
Symbol
High-order bit of watchdog timer
Reserved bits
WDC7
WDTS
Symbol
WDC
Prescaler
1/128
1/16
1/2
Prescaler select bit
“CM07 = 0”
“WDC7 = 0”
“CM07 = 0”
“WDC7 = 1”
“CM07 = 1”
Bit name
Address
000E
Address
000F
16
Function
16
Indeterminate
When reset
When reset
Watchdog timer
000?????
Must always be set to “0”
0 : Divided by 16
1 : Divided by 128
and ON-SCREEN DISPLAY CONTROLLER
MITSUBISHI MICROCOMPUTERS
Set to
“7FFF
2
Function
M306V2ME-XXXFP
16
”
M306V2EEFP
16
”
Watchdog timer
interrupt request
R
R
W
W
Rev. 1.0