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ST72321BXXX-AUTO Datasheet(PDF) 99 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) 99 Page - STMicroelectronics

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ST72321Bxxx-Auto
PWM auto-reload timer (ART)
99/247
12.3.2
Counter access register (ARTCAR)
12.3.3
Auto-reload register (ARTARR)
This register has two PWM management functions:
–
Adjusting the PWM frequency
–
Setting the PWM duty cycle resolution
fINPUT / 8
1 MHz
0
1
1
fINPUT / 16
500 kHz
1
0
0
fINPUT / 32
250 kHz
1
0
1
fINPUT / 64
125 kHz
1
1
0
fINPUT / 128
62.5 kHz
1
1
1
Table 45.
Prescaler selection for ART (continued)
fCOUNTER
With fINPUT = 8 MHz
CC2
CC1
CC0
ARTCAR
Reset value: 0000 0000 (00h)
7
654
32
10
CA[7:0]
RW
Table 46.
ARTCAR register description
Bit
Name
Function
7:0
CA[7:0]
Counter Access Data
These bits can be set and cleared either by hardware or by software. The
ARTCAR register is used to read or write the auto-reload counter “on the fly”
(while it is counting).
ARTARR
Reset value: 0000 0000 (00h)
7
654
32
10
AR[7:0]
RW
Table 47.
ARTAAR register description
Bit
Name
Function
7:0
AR[7:0]
Counter Auto-Reload Data
These bits are set and cleared by software. They are used to hold the auto-reload
value which is automatically loaded in the counter when an overflow occurs. At the
same time, the PWM output levels are changed according to the corresponding
OPx bit in the PWMCR register.


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