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參數(shù)資料
| 型號： | M37702M2B-XXXFP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單片16位CMOS微機 |
| 文件頁數(shù)： | 22/59頁 |
| 文件大?。?/td> | 811K |
| 代理商： | M37702M2B-XXXFP |
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22
MITSUBISHI MICROCOMPUTERS
M37702M2AXXXFP, M37702M2BXXXFP
M37702S1AFP, M37702S1BFP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
(4) Pulse width modulation mode [11]
Figure 24 shows the bit configuration of the timer Ai mode register
during pulse width modulation mode. In pulse width modulation
mode, bits 0, 1, and 2 must be set to “1”. Bit 5 is used to deter-
mine whether to perform 16-bit length pulse width modulator or
8-bit length pulse width modulator. 16-bit length pulse width modu-
lator is performed when bit 5 is “0” and 8-bit length pulse width
modulator is performed when it is “1”. The 16-bit length pulse
width modulator is described first.
The pulse width modulator can be started with a software trigger
or with an input signal from a TAi
IN
pin (external trigger).
The software trigger mode is selected when bit 4 is “0”. Pulse
width modulator is started and pulse is output from TAi
OUT
when
the timer Ai start flag is set to “1”.
The external trigger mode is selected when bit 4 is “1”. Pulse width
modulator starts when a trigger signal is input from the TAi
IN
pin
when the timer Ai start flag is “1”. Whether to trigger at the fall or
rise of the trigger signal is determined by bit 3. The trigger is at the
fall of the trigger signal when bit 3 is “0” and at the rise when it is
“1”.
When data is written to timer Ai with the pulse width modulator
halted, it is written to the reload register and the counter.
Then when the timer Ai start flag is set to “1” and a software trig-
ger or an external trigger is issued to start modulation, the
waveform shown in Figure 25 is output continuously. Once modu-
lation is started, triggers are not accepted. If the value in the
reload register is m, the duration “H” of pulse is
1
selected clock frequency
and the output pulse period is
An interrupt request signal is generated and the interrupt request
bit in the timer Ai interrupt control register is set at each fall of the
output pulse.
The width of the output pulse is changed by updating timer data.
The update can be performed at any time. The output pulse width
is changed at the rise of the pulse after data is written to the timer.
The contents of the reload register are transferred to the counter
just before the rise of the next pulse so that the pulse width is
changed from the next output pulse.
Undefined data is read when timer Ai is read.
The 8-bit length pulse width modulator is described next.
The 8-bit length pulse width modulator is selected when the timer
Ai mode register bit 5 is “1”.
The reload register and the counter are both divided into 8-bit
halves.
The low order 8 bits function as a prescaler and the high order 8
bits function as the 8-bit length pulse width modulator. The
prescaler counts the clock selected by bits 6 and 7. A pulse is gen-
erated when the counter reaches 0000
16
as shown in Figure 26.
At the same time, the contents of the reload register is transferred
to the counter and count is continued.
m
1
selected clock frequency
(2
16
–
1).
Fig. 24 Timer Ai mode register bit configuration during pulse
width modulation mode
7 6 5 4 3 2 1 0
1 1
1
Timer A0 mode register 56
16
Timer A1 mode register 57
16
Timer A2 mode register 58
16
Timer A3 mode register 59
16
Timer A4 mode register 5A
16
Addresses
1 : Always “1” in pulse width
modulation mode
0
:
Software trigger
1 0
: Trigger at the falling of TAi
IN
input
1 1 : Trigger at the rising of TAi
IN
input
Clock source selection bit
0 0 : Select f
2
0 1 : Select f
16
1 0 : Select f
64
1 1 : Select f
512
1 1 : Always “11” in pulse width
modulation mode
0 : 16 bit pulse width modulator
1 : 8 bit pulse width modulator
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| M37702M2L | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M37702M2L249HP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M37702M2L-249HP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M37702M2L-265HP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M37702M2LXXXGP | 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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