M30240ECFP MITSUBISHI [Mitsubishi Electric Semiconductor], M30240ECFP Datasheet - Page 40

• Manufacturer Part Number: M30240ECFP
• Description: M30240 Group Specification
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

Specifications in this manual are tentative and subject to change
Watchdog Timer
Figure 1.21: Block diagram of watchdog timer
Figure 1.22: Watchdog timer control and start registers
Internal clock
b7
Watchdog timer start register
Watchdog timer control register
b7
Write to the watchdog
timer start register
(address 000E
b6
0
b5
0
RESET
b4 b3
16
)
b2
b1
b0
b0
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 bit
Reserved bit
WDC7
Symbol
Symbol
WDTS
WDC
1/128
1/16
Prescaler select bit
WDC7 = 0
WDC7 = 1
1-40
Bit name
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Address
Address
000E
000F
16
16
Function
Indeterminate
Set to 7FFF
000XXXXX
When reset
When reset
Must always be set to 0
Must always be set to 0
0 : Divided by 16
1 : Divided by 128
Watchdog timer
2
16
Watchdog timer
interrupt request
Function
Mitsubishi microcomputers
M30240 Group
16
R
R
W
W