參數(shù)資料
型號： M38037M6-122FP
廠商： Mitsubishi Electric Corporation
英文描述： TACHOMETER ONE CHANNEL
中文描述： 單芯片8位CMOS微機(jī)
文件頁數(shù)： 64/135頁
文件大小： 2055K
代理商： M38037M6-122FP
64
3803/3804 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
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 X
IN
or that clock input di-
vided by 2 or the clock input X
CIN
or that clock input divided by 2
in low-speed mode.
Data Setting
The PWM output pin also functions as port P5
6
. 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(X
IN
)
= 31.875
(n+1)
μ
s (when f(X
IN
) = 8 MHz)
Output pulse “H” term = PWM period
m / 255
= 0.125
(n+1)
m
μ
s
(when f(X
IN
) = 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
μ
s
T = [31.875 5 (n+1)]
μ
s
P
W
M
o
u
t
p
u
t
m: Contents of PWM register
n : Contents of PWM prescaler
T : PWM period (when f(X
IN
) = 8 MHz, count source
is f(X
IN
))
Data bus
Count source
selection bit
“
0
”
“
1
”
P
a
W
e
r
M
p
e
p
r
e
s
c
l
r
-
l
a
t
c
h
PWM
register pre-latch
PWM
prescaler latch
PWM
register latch
T
r
a
n
s
f
e
r
c
o
n
t
r
o
l
c
i
r
c
u
i
t
PWM register
1
/
2
X
I
o
X
C
N
r
I
N
Port P5
6
latch
PWM enable bit
P
o
r
t
P
5
6
P
W
M
p
r
e
s
c
a
l
e
r
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