參數(shù)資料
型號(hào)： 7513
英文描述： 7513 Group Datasheet Datasheet 1067K/FEB.06.01
中文描述： 7513組數(shù)據(jù)表數(shù)據(jù)表1067K/FEB.06.01
文件頁(yè)數(shù)： 35/66頁(yè)
文件大?。?/td> 1067K
代理商： 7513
34
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
7513 Group
PULSE WIDTH MODULATION (PWM)
The 7513 group has a PWM function with an 8-bit resolution,
based on a signal that is the clock input X
IN
or that clock input di-
vided by 2.
Data Setting
The PWM output pin also functions as ports P5
0
and P5
1
. Set the
PWM period by the PWM prescaler, and set the period during
which the output pulse is an
“
H
”
by the PWM register.
If PWM count source is f(X
IN
) and 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
)
= 51
(n+1)
μ
s (when f(X
IN
) = 5 MHz)
Output pulse
“
H
”
period = PWM period
m/255
= 0.2
(n+1)
m
μ
s
(when f(X
IN
) = 5 MHz)
PWM Operation
When at least either bit 1 (PWM
0
output enable bit) or bit 2 (PWM
1
output enable bit) of the PWM control register is set to
“
1
”
, opera-
tion starts by initializing the PWM output circuit, and pulses are
output starting at an
“
H
”
. When one PWM output is enabled and
that the other PWM output is enabled, PWM output which is en-
abled to output later starts pulse output from halfway.
When the PWM register or PWM prescaler is updated during
which the change was made.
Fig. 31 Timing of PWM cycle
Fig. 32 Block diagram of PWM function
51
m
(n+1)
255
μ
s
T = [51
(n+1)]
μ
s
PWM output
m: Contents of PWM register
n : Contents of PWM prescaler
T : PWM cycle (when f(X
IN
) = 5 MHz)
D
a
t
a
b
u
s
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
P
t
e
W
r
M
p
r
r
e
g
i
s
e
-
l
a
t
c
h
P
c
W
a
M
e
l
p
r
e
s
l
r
a
t
c
h
PWM
register latch
Transfer control circuit
P
W
M
c
i
r
c
u
i
t
1
/
2
X
I
N
P
W
M
0
e
n
a
b
l
e
b
i
t
P
o
r
t
P
5
1
P
W
M
p
r
e
s
c
a
l
e
r
PWM
1
enable bit
Port P5
0
相關(guān)PDF資料
PDF描述
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