M306V0ME Mitsubishi, M306V0ME Datasheet - Page 68

• Manufacturer Part Number: M306V0ME
• 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 control register
b7
Watchdog timer start register
b6
0
RESET
HOLD
BCLK
b5
0
16
)
b4
b3
b2
b1
b0
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.
Bit symbol
High-order bit of watchdog timer
Reserved bits
WDC7
Symbol
Symbol
WDC
WDTS
Prescaler
1/128
1/16
1/2
Prescaler select bit
“CM07 = 0”
“WDC7 = 0”
“CM07 = 0”
“WDC7 = 1”
“CM07 = 1”
Bit name
Address
Address
000F
000E
16
16
Function
Indeterminate
When reset
000?????
When reset
Must always be set to “0”
0 : Divided by 16
1 : Divided by 128
Watchdog timer
and ON-SCREEN DISPLAY CONTROLLER
MITSUBISHI MICROCOMPUTERS
Set to
“7FFF
2
Function
M306V0ME-XXXFP
16
”
M306V0EEFP
16
”
Watchdog timer
interrupt request
R
R
W
W
Rev. 1.0