ST7L05 datasheet(42/104 Pages) STMICROELECTRONICS

Part #	ST7L05

Description	8-bit MCU for automotive with single voltage Flash memory, data EEPROM, ADC, timers, SPI

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Manufacturer	STMICROELECTRONICS [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 8-bit

upcounter with two software-selectable timebase

periods, an 8-bit input capture register and watch-

dog function.

11.1.2 Main Features

■ Realtime Clock

– 8-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 25. Lite Timer Block Diagram

LTCSR

WATCHDOG

8-bit UPCOUNTER

/2

8-bit

fLTIMER

fWDG

8

LTIC

fOSC/32

WDGD

WDGE

WDG

TBF

TBIE

TB

ICF

ICIE

WATCHDOG RESET

LTTB INTERRUPT REQUEST

LTIC INTERRUPT REQUEST

LTICR

INPUT CAPTURE

REGISTER

1

0

1 or 2 ms

Timebase

(@ 8 MHz

fOSC)

To 12-bit AT TImer

fLTIMER

RF

0

7

1

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