ST72321R7-Auto datasheet(94/243 Pages) STMICROELECTRONICS

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PWM auto-reload timer (ART)

ST72321xx-Auto

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Doc ID 13829 Rev 1

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

fINPUT / 16

500 kHz

fINPUT / 32

250 kHz

fINPUT / 64

125 kHz

fINPUT / 128

62.5 kHz

Table 46.

Prescaler selection for ART (continued)

fCOUNTER

With fINPUT = 8 MHz

CC2

CC1

CC0

ARTCAR

Reset value: 0000 0000 (00h)

543

CA[7:0]

Table 47.

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)

543

AR[7:0]

Table 48.

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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