參數(shù)資料
型號(hào)： ST7FLITE09Y0M1
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO16
封裝： 0.150 INCH, PLASTIC, SOP-16
文件頁(yè)數(shù)： 54/111頁(yè)
文件大?。?/td> 671K
代理商： ST7FLITE09Y0M1
ST7FLITE0
47/111
12-BIT AUTORELOAD TIMER (Cont’d)
11.2.3 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 50).
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.
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 .
Figure 33. PWM Function
Figure 34. PWM Signal Example
DUTY CYCLE
REGISTER
AUTO-RELOAD
REGISTER
PWM0
OUTPUT
t
4095
000
WITH OE0=1
AND OP0=0
(ATR)
(DCR0)
WITH OE0=1
AND OP0=1
COUNTER
PWM0
OUTPUT
t
WITH
OE0=1
AND
OP0=0
FFDh
FFEh
FFFh
FFDh
FFEh
FFFh
FFDh
FFEh
DCR0=FFEh
ATR= FFDh
fCOUNTER
1
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ST7FLITE09Y0U6 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-bit microcontroller with single voltage Flash memory, data EEPROM, ADC, timers, SPI
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