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ST72321BXXX-AUTO Datasheet(PDF) 100 Page - STMicroelectronics

Part # ST72321BXXX-AUTO
Description  8-bit MCU for automotive with 32 to 60 Kbyte Flash/ROM, ADC, 5 timers, SPI, SCI, I2C interface
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72321BXXX-AUTO Datasheet(HTML) 100 Page - STMicroelectronics

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PWM auto-reload timer (ART)
ST72321Bxxx-Auto
100/247
12.3.4
PWM control register (PWMCR)
Table 48.
PWM frequency versus resolution
ARTARR value
Resolution
fPWM
Min
Max
0
8-bit
~0.244 kHz
31.25 kHz
[ 0..127 ]
> 7-bit
~0.244 kHz
62.5 kHz
[ 128..191 ]
> 6-bit
~0.488 kHz
125 kHz
[ 192..223 ]
> 5-bit
~0.977 kHz
250 kHz
[ 224..239 ]
> 4-bit
~1.953 kHz
500 kHz
PWMCR
Reset value: 0000 0000 (00h)
7
654
32
10
OE[3:0]
OP[3:0]
RW
RW
Table 49.
PWMCR register description
Bit
Name
Function
7:4
OE[3:0]
PWM Output Enable
These bits are set and cleared by software. They enable or disable the PWM
output channels independently acting on the corresponding I/O pin.
0: PWM output disabled
1: PWM output enabled
3:0
OP[3:0]
PWM Output Polarity
These bits are set and cleared by software. They independently select the polarity
of the four PWM output signals (see Table 50).
Table 50.
PWM output signal polarity selection
PWMx output level
OPx(1)
1.
When an OPx bit is modified, the PWMx output signal polarity is immediately reversed.
Counter <= OCRx
Counter > OCRx
10
0
01
1


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