ST7LITE1 datasheet(55/131 Pages) STMICROELECTRONICS

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ST7LITE1

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11.2 12-BIT AUTORELOAD TIMER 2 (AT2)

11.2.1 Introduction

The 12-bit Autoreload Timer can be used for gen-

eral-purpose timing functions. It is based on a free-

running 12-bit upcounter with an input capture reg-

ister and four PWM output channels. There are 6

external pins:

– Four PWM outputs

– ATIC pin for the Input Capture function

– BREAK pin for forcing a break condition on the

PWM outputs

11.2.2 Main Features

■ 12-bit upcounter with 12-bit autoreload register

(ATR)

■ Maskable overflow interrupt

■ Generation of four independent PWMx signals

■ Frequency 2KHz-4MHz (@ 8 MHz fCPU)

– Programmable duty-cycles

– Polarity control

– Programmable output modes

– Maskable Compare interrupt

■ Input Capture

– 12-bit input capture register (ATICR)

– Triggered by rising and falling edges

– Maskable IC interrupt

Figure 33. Block Diagram

ATCSR

CMPIE

OVFIE

OVF

CK0

CK1

ICIE

ICF

12-BIT AUTORELOAD REGISTER

12-BIT UPCOUNTER

CMPF2

CMPF1

CMPF3

CMPF0

CMP

REQUEST

OVF INTERRUPT

REQUEST

fCPU

ATIC

12-BIT INPUT CAPTURE REGISTER

IC INTERRUPT

REQUEST

ATR

ATICR

fCOUNTER

CNTR

32 MHz

(1 ms

fLTIMER

@ 8MHz)

CMPFx bit

POL-

ARITY

OPx bit

PWMx

COMP-

PARE

fPWM

OEx bit

4 PWM Channels

INTERRUPT

timebase

DCR0H

DCR0L

Preload

on OVF Event

12-BIT DUTY CYCLE VALUE (shadow)

IF TRAN=1

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