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| 型號(hào)： | M30240M4-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, MROM, MICROCONTROLLER, PQFP80 |
| 封裝： | 0.80 MM PITCH, PLASTIC, QFP-80 |
| 文件頁(yè)數(shù)： | 57/125頁(yè) |
| 文件大?。?/td> | 753K |
| 代理商： | M30240M4-XXXFP |
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Mitsubishi microcomputers
M16C / 24 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
39
CONFIDENTIAL
Preliminary Specifications REV.B
Specifications in this manual are tentative and subject to change
Watchdog Timer
2.16 Watchdog Timer
The watchdog timer has the function of detecting when the program is out of control. The watchdog timer
is a 15-bit counter that decrements using the clock derived by dividing the internal clock
φ using the
prescaler. A watchdog timer interrupt is generated when an underflow occurs in the watchdog timer. Bit
7 of the watchdog timer control register (address 000F16) selects the prescaler division ratio (by 16 or
128). Table 11 shows the periodic table for the watchdog timer
.
Note: Error is generated by the prescaler
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 is cancelled, the watchdog timer and prescaler are both stopped.
The count is started by writing to the watchdog timer start register (address 000E16).
Figure 21 shows the block diagram of the watchdog timer. Figure 22 shows the watchdog timer-related
registers.
Figure 21:
Block diagram of watchdog timer
Table 11:
Watchdog timer periodic table (XIN = 10MHz)
CM06
CM17
CM16
Internal clock
φ
WDC7
Period
0
10MHz
0
Approx. 52.4ms (Note)
1
Approx. 419.2ms (Note)
0
1
5MHz
0
Approx. 104.9ms (Note)
1
Approx. 838.8ms (Note)
0
1
0
2.5MHz
0
Approx. 209.7ms (Note)
1
Approx. 1.68s (Note)
0
1
0.625MHz
0
Approx. 838.8ms (Note)
1
Approx. 6.71s (Note)
1
Invalid
1.25MHz
0
Approx. 419.2ms (Note)
1
Approx. 3.35s (Note)
1/16
1/128
Watchdog timer
interrupt request
Set to 7FFF16
WDC7 = 0
WDC7 = 1
RESET
Write to the watchdog
timer start register
(address 000E16)
HOLD
Internal clock
φ
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M30240M5 | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30240M5-XXXFP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30240M6 | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30240M6-XXXFP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30240M7 | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
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