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參數(shù)資料
| 型號(hào)： | M37640E8 |
| 廠(chǎng)商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCONTROLLER |
| 中文描述： | 單芯片8位CMOS單片機(jī) |
| 文件頁(yè)數(shù)： | 100/172頁(yè) |
| 文件大小： | 1193K |
| 代理商： | M37640E8 |
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2-88
7/9/98
Timers
7600 Series
M37640E8-XXXF Preliminary Specification
Mitsubishi Microcomputers
2.13.4 Timer 2
Timer 2 is an 8-bit timer with an 8-bit reload latch.
T123M7 (bit 7 of T123M) is the Timer 1 and 2 Data Write Control Bit. If T123M7 is “1”, data
written to Timer 2 is placed only in the Timer 2 reload latch (see Figure 2-50). The latch value is
loaded into Timer 2 after Timer 2 underflows. If the T123M7 is “0”, the value written to Timer 2 is
placed in Timer 2 and the Timer 2 reload latch. At reset, T123M2 is set to a “0”.
The Timer 2 reload latch value is not affected by a change of the count source. However, because
changing the count source may cause an inadvertent countdown of the timer, the timer should be
rewritten when the count source is changed.
2.13.4.1
Timer Mode
Count Source:
If T123M3 is “0”, the Timer 2 count source is the Timer 1 underflow output.
If T123M3 is “1”, the Timer 2 count source is
Φ
.
In Timer mode, each time the timer underflows, the corresponding timer interrupt request bit is set to a
“1”, the contents of the timer latch are loaded into the timer, and the count down sequence begins again.
2.13.4.2
Pulse Output Mode
Count Source:
If T123M3 is “0”, the Timer 2 count source is the Timer 1 underflow output.
If T123M3 is “1”, the Timer 2 count source is
Φ
.
Timer 2 Pulse Output mode is enabled by setting T123M6 to a “1” and T123M0 to a “1”. Each time
the Timer 2 underflows, the output of the TOUT pin is inverted, and the corresponding Timer 2
interrupt request bit is set to a “1”. The repeated inversion of the TOUT pin output produces a
rectangular waveform with a duty ratio of 50 percent. The initial level of the output is determined by
the TOUT polarity select bit (T123M5). When this bit is “0”, the output starts from a high level.
When this bit is “1”, the output starts from a low level.
2.13.5 Timer 3
Timer 3 is an 8-bit timer with an 8-bit reload latch. The Timer 3 reload latch value is not affected by
a change of the count source. Because changing the count source may cause an inadvertent countdown
of the timer, the timer should be rewritten whenever the count source is changed.
2.13.5.1
Timer Mode
Count Source:
If T123M4 is “0”, the Timer 3 count source is the Timer 1 underflow output.
If T123M4 is “1”, the count source is
Φ
/8
In Timer mode, each time the timer underflows, the corresponding timer interrupt request bit is set to
a “1”, the contents of the timer latch are loaded into the timer, and the count down sequence begins
again.
Data written to Timer 3 is always placed in Timer 3 and the Timer 3 reload latch.
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PDF描述 |
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| M37641F8-XXXFP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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| M37641M8-XXXFP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37641M8 | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37641F8FP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37640E8FP | 制造商:MITSUBISHI 制造商全稱(chēng):Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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| M37640M4T | 制造商:MITSUBISHI 制造商全稱(chēng):Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37640M8-111FP | 制造商:MITSUBISHI 制造商全稱(chēng):Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37640M8-126FP | 制造商:MITSUBISHI 制造商全稱(chēng):Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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