參數(shù)資料
型號(hào)： M38203E4FP
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP80
封裝： 0.80 MM PITCH, PLASTIC, QFP-80
文件頁(yè)數(shù)： 61/69頁(yè)
文件大?。?/td> 944K
代理商： M38203E4FP
Rev.4.01
Nov 14, 2003
page 64 of 136
3803/3804 Group
PULSE WIDTH MODULATION (PWM)
The 3803/3804 group has PWM functions with an 8-bit resolution,
based on a signal that is the clock input XIN or that clock input di-
vided by 2 or the clock input XCIN or that clock input divided by 2
in low-speed mode.
Data Setting
The PWM output pin also functions as port P56. Set the PWM pe-
riod 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(XIN)
= 31.875 (n+1)
s (when f(XIN) = 8 MHz)
Output pulse “H” term = PWM period m / 255
= 0.125 (n+1) m
s
(when f(XIN) = 8 MHz)
Fig. 53 Timing of PWM period
Fig. 54 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
s
T = [31.875 (n+1)]
s
PWM output
m: Contents of PWM register
n : Contents of PWM prescaler
T : PWM period (when f(XIN) = 8 MHz, count source
is f(XIN))
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
XIN
or
XCIN
Port P56 latch
PWM enable bit
Port P56
PWM prescaler
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參數(shù)描述
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