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參數(shù)資料
| 型號(hào)： | M30240F4 |
| 廠(chǎng)商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單片16位CMOS微機(jī) |
| 文件頁(yè)數(shù)： | 39/142頁(yè) |
| 文件大小： | 1637K |
| 代理商： | M30240F4 |
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1-39
Mitsubishi microcomputers
M30240 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Preliminary Specifications REV. E
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 39a 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 000F
16
) selects the prescaler division ratio (by 16 or
128). Table 1.12 shows the periodic table for the watchdog timer.
Table 1.12:
Watchdog timer periodic table (f(X
IN
)=10MHz)
The watchdog timer is initialized by writing to the watchdog timer start register (address 000E
16
) 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 000E
16
).
Figure 1.21 shows the block diagram of the watchdog timer. Figure 1.22 shows the watchdog timer-
related registers.
CM06
CM17
CM16
Internal
clock
Φ
WDC7
Period
0
0
0
10MHz
0
Approx. 52.4ms
1
Approx. 419.2ms
0
0
1
5MHz
0
Approx. 104.9ms
1
Approx. 838.8ms
0
1
0
2.5MHz
0
Approx. 209.7ms
1
Approx. 1.68s
0
1
1
0.625MHz
0
Approx. 838.8ms
1
Approx. 6.71s
1
Invalid
Invalid
1.25MHz
0
Approx. 419.2ms
1
Approx. 3.35s
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| M30240F7 | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30240F8 | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M30240F4-XXXFP | 制造商:MITSUBISHI 制造商全稱(chēng):Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30240F5 | 制造商:MITSUBISHI 制造商全稱(chēng):Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30240F5-XXXFP | 制造商:MITSUBISHI 制造商全稱(chēng):Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30240F6 | 制造商:MITSUBISHI 制造商全稱(chēng):Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M30240F6-XXXFP | 制造商:MITSUBISHI 制造商全稱(chēng):Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
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