ST7FOXU0 datasheet(70/123 Pages) STMICROELECTRONICS

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On-chip peripherals

ST7FOXU0

70/123

10.2

12-bit Autoreload Timer (AT)

10.2.1

Introduction

The 12-bit Autoreload Timer can be used for general-purpose timing functions. It is based

on a free-running 12-bit upcounter with a PWM output channel.

10.2.2

Main Features

●

12-bit upcounter with 12-bit autoreload register (ATR)

●

Maskable overflow interrupt

●

PWM signal generator

●

Frequency range 2KHz-4MHz (@ 8 MHz fCPU)

–

Programmable duty-cycle

–

Polarity control

–

Maskable Compare interrupt

●

Output Compare Function

Figure 32.

Block diagram

10.2.3

Functional description

PWM Mode

This mode allows a Pulse Width Modulated signals to be generated on the PWM0 output pin

with minimum core processing overhead. The PWM0 output signal can be enabled or

disabled using the OE0 bit in the PWMCR register. When this bit is set the PWM I/O pin is

configured as output push-pull alternate function.

Note:

CMPF0 is available in PWM mode (see PWM0CSR description on page 76).

ATCSR

CMPIE

OVFIE

OVF

CK0

CK1

12-BIT AUTORELOAD VALUE

12-BIT UPCOUNTER

CMPF0 bit

CMPF0

CMP INTERRUPT

REQUEST

OVF INTERRUPT

REQUEST

fCPU

ATR

POL-

ARITY

OP0 bit

PWM0

COMP-

PARE

fCOUNTER

fPWM

OE0 bit

CNTR

(1 ms timebase

fLTIMER

DCR0H

DCR0L

Update on OVF Event

Preload

@ 8MHz)

on OVF Event

12-BIT DUTY CYCLE VALUE (shadow)

OE0 bit

IF OE0=1

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