ST7LITEUS5 datasheet(71/136 Pages) STMICROELECTRONICS

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10.2

12-bit auto-reload timer (AT)

10.2.1

Introduction

The 12-bit auto-reload 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 auto-reload register (ATR)

●

Maskable overflow interrupt

●

PWM signal generator

●

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

–

Programmable duty-cycle

–

Polarity control

–

Maskable compare interrupt

●

Output compare function

Figure 33.

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 Section : PWM0 control/status register

(PWM0CSR)).

ATCSR

CMPIE

OVFIE

OVF

CK0

CK1

12-BIT AUTO-RELOAD 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

@ 8 MHz)

on OVF Event

12-BIT DUTY CYCLE VALUE (shadow)

OE0 bit

IF OE0=1

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