參數(shù)資料
型號: M38039MCH-XXXSP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8.4 MHz, MICROCONTROLLER, PDIP64
封裝: 0.750 INCH, 1.78 MM PITCH, SHRINK, PLASTIC, DIP-64
文件頁數(shù): 70/117頁
文件大?。?/td> 1873K
代理商: M38039MCH-XXXSP
Rev.3.11
Apr 5, 2006
Page 56 of 113
REJ03B0017-0311
3803 Group (Spec.H)
PULSE WIDTH MODULATION (PWM)
The 3803 group (Spec.H QzROM version) has PWM functions
with an 8-bit resolution, based on a signal that is the clock input
XIN or that clock input divided 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
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(XIN)
= 31.875 × (n+1)
s
(when f(XIN) = 8 MHz, count source selection bit = “0”)
Output pulse “H” term = PWM period × m / 255
= 0.125 × (n+1) × m
s
(when f(XIN) = 8 MHz, count source selection bit = “0”)
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.
Fig 46. Timing of PWM period
Fig 47. 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(XIN) = 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
XIN
(XCIN at low-
speed mode)
Port P56 latch
PWM function enable bit
Port P56
PWM prescaler
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