參數(shù)資料
型號(hào)： M388504E6FP
廠(chǎng)商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述： 單芯片8位CMOS微機(jī)
文件頁(yè)數(shù)： 29/51頁(yè)
文件大?。?/td> 736K
代理商： M388504E6FP
29
3850 Group (Spec. H)
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
PULSE WIDTH MODULATION (PWM)
The 3850 group (spec. H) has a PWM function with an 8-bit
resolution, based on a signal that is the clock input X
IN
or that
clock input divided by 2.
Data Setting
The PWM output pin also functions as port P4
4
. Set the PWM
period by the PWM prescaler, and set the “H” term of output pulse
by the PWM register.
If the value in the PWM prescaler is n and the value in the PWM
register is m (where n = 0 to 255 and m = 0 to 255) :
PWM period = 255
(n+1) / f(X
IN
)
= 31.875
(n+1)
μ
s
(when f(X
IN
) = 8 MHz,count source selection bit = “0”)
Output pulse “H” term = PWM period
m / 255
= 0.125
(n+1)
m
μ
s
(when f(X
IN
) = 8 MHz,count source selection bit = “0”)
Fig. 27 Timing of PWM period
Fig. 28 Block diagram of PWM function
PWM Operation
When bit 0 (PWM enable bit) of the PWM control register is set to
“1”, operation starts by initializing the PWM output circuit, and
pulses are output starting at an “H”.
If the PWM register or PWM prescaler is updated during PWM
output, the pulses will change in the cycle after the one in which
the change was made.
31.875
m
(n+1)
255
μ
s
T = [31.875
(n+1)]
μ
s
PWM output
m: Contents of PWM register
n : Contents of PWM prescaler
T : PWM period (when f(X
IN
) = 8 MHz,count source
selection bit = “0”)
Data bus
Count source
selection bit
“0”
“1”
PWM
prescaler pre-latch
PWM
register pre-latch
PWM
prescaler latch
PWM
register latch
Transfer control circuit
PWM register
1/2
X
Port P4
4
latch
PWM enable bit
Port P4
4
PWM prescaler
(X
CIN
at low-speed mode)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M388504E6SP 制造商:MITSUBISHI 制造商全稱(chēng):Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M388504E6SS 制造商:MITSUBISHI 制造商全稱(chēng):Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M38850F1-HP 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M38850F2-HP 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M38850F3-HP 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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