ST7LITEU05 datasheet(53/115 Pages) STMICROELECTRONICS

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11 ON-CHIP PERIPHERALS

11.1 LITE TIMER (LT)

11.1.1 Introduction

The Lite Timer can be used for general-purpose

timing functions. It is based on a free-running 13-

bit upcounter with two software-selectable time-

base periods, an 8-bit input capture register and

watchdog function.

11.1.2 Main Features

■

Realtime Clock

– 13-bit upcounter

– 1 ms or 2 ms timebase period (@ 8 MHz fOSC)

– Maskable timebase interrupt

■

Input Capture

– 8-bit input capture register (LTICR)

– Maskable interrupt with wakeup from Halt

Mode capability

■

Watchdog

– Enabled by hardware or software (configura-

ble by option byte)

– Optional reset on HALT instruction (configura-

ble by option byte)

– Automatically resets the device unless disable

bit is refreshed

– Software reset (Forced Watchdog reset)

– Watchdog reset status flag

Figure 34. Lite Timer Block Diagram

LTCSR

WATCHDOG

13-bit UPCOUNTER

8-bit

fLTIMER

fWDG

8 MSB

LTIC

fOSC

WDGD

WDGE

WDG

TBF

TBIE

ICF

ICIE

WATCHDOG RESET

LTTB INTERRUPT REQUEST

LTIC INTERRUPT REQUEST

LTICR

INPUT CAPTURE

1 or 2 ms

Timebase

(@ 8MHz

fOSC)

To 12-bit AT TImer

fLTIMER

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