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参数资料
型号： ST7PLITEUS5M6TR
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO8
封装： 0.150 INCH, LEAD FREE, PLASTIC, SOP-8
文件页数： 57/108页
文件大小： 1957K
代理商： ST7PLITEUS5M6TR
ST7LITEUSx
52/108
12-BIT AUTORELOAD TIMER (Cont’d)
10.2.3 Functional Description
PWM Mode
This mode allows a Pulse Width Modulated sig-
nals to be generated on the PWM0 output pin with
minimum core processing overhead. The PWM0
output signal can be enabled or disabled using the
OE0 bit in the PWMCR register. When this bit is
set the PWM I/O pin is configured as output push-
pull alternate function.
Note: CMPF0 is available in PWM mode (see
PWM0CSR description on page 55).
PWM Frequency and Duty Cycle
The PWM signal frequency (fPWM) is controlled by
the counter period and the ATR register value.
fPWM = fCOUNTER / (4096 - ATR)
Following the above formula, if fCPU is 8 MHz, the
maximum value of fPWM is 4 Mhz (ATR register
value = 4094), and the minimum value is 2 kHz
(ATR register value = 0).
Note: The maximum value of ATR is 4094 be-
cause it must be lower than the DCR value which
must be 4095 in this case.
At reset, the counter starts counting from 0.
Software must write the duty cycle value in the
DCR0H and DCR0L preload registers. The
DCR0H register must be written first. See caution
below.
When a upcounter overflow occurs (OVF event),
the ATR value is loaded in the upcounter, the
preloaded Duty cycle value is transferred to the
Duty Cycle register and the PWM0 signal is set to
a high level. When the upcounter matches the
DCRx value the PWM0 signals is set to a low level.
To obtain a signal on the PWM0 pin, the contents
of the DCR0 register must be greater than the con-
tents of the ATR register.
The polarity bit can be used to invert the output
signal.
The maximum available resolution for the PWM0
duty cycle is:
Resolution = 1 / (4096 - ATR)
Note: To get the maximum resolution (1/4096), the
ATR register must be 0. With this maximum reso-
lution and assuming that DCR=ATR,
a 0% or
100% duty cycle can be obtained by changing the
polarity .
Caution: As soon as the DCR0H is written, the
compare function is disabled and will start only
when the DCR0L value is written. If the DCR0H
write occurs just before the compare event, the
signal on the PWM output may not be set to a low
level. In this case, the DCRx register should be up-
dated just after an OVF event. If the DCR and ATR
values are close, then the DCRx register shouldbe
updated just before an OVF event, in order not to
miss a compare event and to have the right signal
applied on the PWM output.
Figure 34. PWM Function
DUTY CYCLE
REGISTER
AUTO-RELOAD
REGISTER
PWM0
OU
TPU
T
t
4095
000
WITH OE0=1
AND OP0=0
(ATR)
(DCR0)
WITH OE0=1
AND OP0=1
CO
UNT
ER
1
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