ST72321AR7-Auto datasheet(95/243 Pages) STMICROELECTRONICS

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ST72321xx-Auto

PWM auto-reload timer (ART)

Doc ID 13829 Rev 1

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12.3.4

PWM control register (PWMCR)

Table 49.

PWM frequency versus resolution

ARTARR value

Resolution

fPWM

Min

Max

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)

543

OE[3:0]

OP[3:0]

Table 50.

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 51).

Table 51.

PWM output signal polarity selection

PWMx output level

OPx(1)

When an OPx bit is modified, the PWMx output signal polarity is immediately reversed.

Counter <= OCRx

Counter > OCRx

100

011

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