參數(shù)資料
型號(hào)： M38504E6FP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO42
封裝： 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-42
文件頁數(shù)： 17/55頁
文件大?。?/td> 867K
代理商： M38504E6FP
21
3850 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
PULSE WIDTH MODULATION (PWM)
The 3850 group has a PWM function with an 8-bit resolution,
based on a signal that is the clock input XIN or that clock input di-
vided by 2.
Data Setting
The PWM output pin also functions as port P44. 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. 20 Timing of PWM period
Fig. 21 Block diagram of PWM function
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(X IN) = 8 MHz)
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.
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
Port P44 latch
PWM enable bit
Port P44
PWM prescaler
相關(guān)PDF資料
PDF描述
M38504M6-XXXSP 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42
M38504E6-XXXSP 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42
M38503E4-XXXSP 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDIP42
M38504M6A-XXXFP 8-BIT, MROM, 6.25 MHz, MICROCONTROLLER, PDSO42
M38503M2A-XXXFP 8-BIT, MROM, 6.25 MHz, MICROCONTROLLER, PDSO42
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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