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参数资料
型号： ST72C171K2B6
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32
封装： SHRINK, PLASTIC, DIP-32
文件页数： 122/152页
文件大小： 2156K
代理商： ST72C171K2B6
ST72C171
71/152
PWM AUTO-RELOAD TIMER (Cont’d)
Independent PWM signal generation
This mode allows up to four Pulse Width Modulat-
ed signals to be generated on the PWMx output
pins with minimum core processing overhead.
This function is stopped during HALT mode.
Each PWMx output signal can be selected inde-
pendently using the corresponding OEx bit in the
PWM Control register (PWMCR). When this bit is
set, the corresponding I/O pin is configured as out-
put push-pull alternate function.
The PWM signals all have the same frequency
which is controlled by the counter period and the
ARR register value.
fPWM = fCOUNTER / (256 - ARR)
When a counter overflow occurs, the PWMx pin
level is changed depending on the corresponding
OPx (output polarity) bit in the PWMCR register.
When the counter reaches the value contained in
one of the output compare register (OCRx) the
corresponding PWMx pin level is restored.
It should be noted that the reload values will also
affect the value and the resolution of the duty cycle
of the PWM output signal. To obtain a signal on a
PWMx pin, the contents of the OCRx register must
be greater than the contents of the ARR register.
The maximum available resolution for the PWMx
duty cycle is:
Resolution = 1 / (256 - ARR)
Note: To get the maximum resolution (1/256), the
ARR register must be 0. With this maximum reso-
lution, 0% and 100% can be obtained by changing
the polarity.
Figure 43. PWM Auto-reload Timer Function
Figure 44. PWM Signal from 0% to 100% Duty Cycle
DUTY CYCLE
REGISTER
AUTO-RELOAD
REGISTER
PW
M
x
O
U
T
P
UT
t
255
000
WITH OEx=1
AND OPx=0
(ARR)
(DCRx)
WITH OEx=1
AND OPx=1
CO
UN
T
E
R
COUNTER
PW
M
x
O
U
T
P
UT
t
WI
T
H
OE
x
=
1
AND
O
P
x=0
FDh
FEh
FFh
FDh
FEh
FFh
FDh
FEh
OCRx=FCh
OCRx=FDh
OCRx=FEh
OCRx=FFh
ARR=FDh
fCOUNTER
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相关代理商/技术参数
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