ST72321R7-Auto datasheet(93/243 Pages) STMICROELECTRONICS

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ST72321xx-Auto

PWM auto-reload timer (ART)

Doc ID 13829 Rev 1

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12.3

ART registers

12.3.1

Control/status register (ARTCSR)

ARTCSR

Reset value: 0000 0000 (00h)

543

EXCL

CC[2:0]

TCE

FCRL

OIE

OVF

Table 45.

ARTCSR register description

Bit

Name

Function

EXCL

External Clock

This bit is set and cleared by software. It selects the input clock for the 7-bit

prescaler.

0: CPU clock

1: External clock

6:4 CC[2:0]

Counter Clock Control

These bits are set and cleared by software. They determine the prescaler division

ratio from fINPUT (see Table 46).

3TCE

Timer Counter Enable

This bit is set and cleared by software. It puts the timer in the lowest power

consumption mode.

0: Counter stopped (prescaler and counter frozen)

1: Counter running

FCRL

Force Counter Re-Load

This bit is write-only and any attempt to read it will yield a logical zero. When set, it

causes the contents of ARTARR register to be loaded into the counter, and the

content of the prescaler register to be cleared in order to initialize the timer before

starting to count.

1OIE

Overflow Interrupt Enable

This bit is set and cleared by software. It allows to enable/disable the interrupt which

is generated when the OVF bit is set.

0: Overflow Interrupt disable

1: Overflow Interrupt enable

0OVF

Overflow Flag

This bit is set by hardware and cleared by software reading the ARTCSR register. It

indicates the transition of the counter from FFh to the ARTARR value.

0: New transition not yet reached

1: Transition reached

Table 46.

Prescaler selection for ART

fCOUNTER

With fINPUT = 8 MHz

CC2

CC1

CC0

fINPUT

8 MHz

000

fINPUT / 2

4 MHz

fINPUT / 4

2 MHz

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