ST7LITE49K2 datasheet(109/245 Pages) STMICROELECTRONICS

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ST7LITE49K2

On-chip peripherals

109/245

11.3

Lite timer 2 (LT2)

11.3.1

Introduction

The Lite timer can be used for general-purpose timing functions. It is based on two free-

running 8-bit upcounters, a watchdog function and an 8-bit Input Capture register.

11.3.2

Main features

●

Real-time clock

–

One 8-bit upcounter 1 ms or 2 ms timebase period (@ 8 MHz fOSC)

–

One 8-bit upcounter with autoreload and programmable timebase period from 4µs

to 1.024 ms in 4 µs increments (@ 8 MHz fOSC)

–

2 Maskable timebase interrupts

●

Input capture

–

8-bit input capture register (LTICR)

●

Maskable interrupt with wakeup from Halt mode capability

Figure 53.

Lite timer 2 block diagram

LTCSR1

8-bit TIMEBASE

8-bit

fLTIMER

LTIC

fOSC/32

TB1F

TB1IE

ICF

ICIE

LTTB1 INTERRUPT REQUEST

LTIC INTERRUPT REQUEST

LTICR

INPUT CAPTURE

1 or 2 ms

Timebase

(@ 8 MHz

fOSC)

To 12-bit AT TImer

fLTIMER

LTCSR2

TB2F

TB2IE

LTTB2

8-bit TIMEBASE

8-bit AUTORELOAD

LTCNTR

LTARR

COUNTER 2

COUNTER 1

Interrupt request

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