ST7LITE3XF2 datasheet(56/173 Pages) STMICROELECTRONICS

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ST7LITE3xF2

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11.2 DUAL 12-BIT AUTORELOAD TIMER 3 (AT3)

11.2.1 Introduction

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

eral-purpose timing functions. It is based on one or

two free-running 12-bit upcounters with an input

capture register and four PWM output channels.

There are 6 external pins:

– Four PWM outputs

– ATIC/LTIC pin for the Input Capture function

– BREAK pin for forcing a break condition on the

PWM outputs

11.2.2 Main Features

■ Single Timer or Dual Timer mode with two 12-bit

upcounters (CNTR1/CNTR2) and two 12-bit

autoreload registers (ATR1/ATR2)

■ Maskable overflow interrupts

■ PWM mode

– Generation of four independent PWMx signals

– Dead time generation for Half bridge driving

mode with programmable dead time

– Frequency 2KHz-4MHz (@ 8 MHz fCPU)

– Programmable duty-cycles

– Polarity control

– Programmable output modes

■ Output Compare Mode

■ Input Capture Mode

– 12-bit input capture register (ATICR)

– Triggered by rising and falling edges

– Maskable IC interrupt

– Long range input capture

■ Break control

■ Flexible Clock control

Figure 34. Single Timer Mode (ENCNTR2=0)

ATIC

PWM0

PWM1

PWM2

PWM3

PWM3 Duty Cycle Generator

12-bit Input Capture

PWM2 Duty Cycle Generator

PWM1 Duty Cycle Generator

PWM0 Duty Cycle Generator

12-Bit Autoreload Register 1

12-Bit Upcounter 1

Clock

Control

Edge Detection Circuit

Output Compare

CMP

Interrupt

OVF1 Interrupt

OE0

OE1

OE2

OE3

Dead Time

Generator

DTE bit

BPEN bit

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