ST7MC2S6 STMicroelectronics, ST7MC2S6 Datasheet - Page 69
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ST7MC2S6
Manufacturer Part Number
ST7MC2S6
Description
8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC,BRUSHLESS MOTOR CONTROL, 5 TIMERS, SPI, LINSCI(TM)
Manufacturer
STMicroelectronics
Datasheet
1.ST7MC1K4.pdf
(309 pages)
Specifications of ST7MC2S6
Hdflash Endurance
100 cycles, data retention
Clock Sources
crystal/ceramic resonator oscillators and by-pass for external clock, clock security system.
Four Power Saving Modes
Halt, Active-Halt, Wait and Slow
Main Clock Controller With
Real time base, Beep and Clock-out capabilities
Two 16-bit Timers With
2 input captures, 2 output compares, external clock input, PWM and pulse generator modes
8-bit Pwm Auto-reload Timer With
2 input captures, 4 PWM outputs, output compare and time base interrupt, external clock with event detector
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ON-CHIP PERIPHERALS (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
ARTARR register value.
When a counter overflow occurs, the PWMx pin
level is changed depending on the corresponding
OPx (output polarity) bit in the PWMCR register.
Figure 40. PWM Auto-reload Timer Function
Figure 41. PWM Signal from 0% to 100% Duty Cycle
f
AUTO-RELOAD
PWM
DUTY CYCLE
(PWMDCRx)
WITH OEx=1
AND OPx=0
WITH OEx=1
AND OPx=1
REGISTER
REGISTER
(ARTARR)
= f
OCRx=FCh
OCRx=FDh
OCRx=FEh
OCRx=FFh
COUNTER
f
COUNTER
COUNTER
255
000
/ (256 - ARTARR)
FDh
FEh
ARTARR=FDh
FFh
FDh
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 ARTARR reg-
ister.
The maximum available resolution for the PWMx
duty cycle is:
Note: To get the maximum resolution (1/256), the
ARTARR register must be 0. With this maximum
resolution, 0% and 100% can be obtained by
changing the polarity.
Resolution = 1 / (256 - ARTARR)
FEh
FFh
ST7MC1xx/ST7MC2xx
FDh
FEh
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