參數(shù)資料
型號: M30240M6-XXXFP
元件分類: 微控制器/微處理器
英文描述: 16-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP80
封裝: 0.80 MM PITCH, PLASTIC, QFP-80
文件頁數(shù): 71/139頁
文件大?。?/td> 1453K
代理商: M30240M6-XXXFP
37
Mitsubishi microcomputers
M30240 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Specifications REV. G
Specifications in this manual are tentative and subject to change
Watchdog Timer
The watchdog timer is initialized by writing to the watchdog timer start register (address 000E16) and
when a watchdog timer interrupt request is generated. The prescaler is initialized only when the
microcomputer is reset. After a reset, the watchdog timer and prescaler are both stopped. The count is
started by writing to the watchdog timer start register (address 000E16).
Figure 1.21 shows the block diagram of the watchdog timer. Figure 1.22 shows the watchdog timer-
related registers.
Figure 1.21: Block diagram of watchdog timer
Figure 1.22: Watchdog timer control and start registers
1/16
1/128
Watchdog timer
Set to 7FFF16
WDC7 = 0
WDC7 = 1
RESET
Write to the watchdog
timer start register
(address 000E16)
Internal clock
Φ
Prescaler
Watchdog timer
interrupt request
Watchdog timer control register (Note)
Symbol
Address
When reset
WDC
000F16
000XXXXX2
Function
Bit symbol
W
R
b7
b6
b5
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
Watchdog timer start register
Symbol
Address
When reset
WDTS
000E16
Indeterminate
W
R
b7
b0
Function
Reserved bit
Must always be set to “0”
0
Note: Set the desired prescale value before initializing the Watchdog timer.
The Watchdog timer is initialized and starts counting after the first write instruction
to this register after reset. Writing any value to this register resets the counter to
7FFF16.
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