ST7LITE05 datasheet(26/122 Pages) STMICROELECTRONICS

Part #	ST7LITE05

Description	8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI

PDF	122 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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26 / 122 page

ST7LITE0, ST7SUPERLITE

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7.4 RESET SEQUENCE MANAGER (RSM)

7.4.1 Introduction

The reset sequence manager includes three RE-

SET sources as shown in Figure 15:

External RESET source pulse

Internal LVD RESET (Low Voltage Detection)

Internal WATCHDOG RESET

These sources act on the RESET pin and it is al-

ways kept low during the delay phase.

The RESET service routine vector is fixed at ad-

dresses FFFEh-FFFFh in the ST7 memory map.

The basic RESET sequence consists of 3 phases

as shown in Figure 14:

Active Phase depending on the RESET source

256 CPU clock cycle delay

RESET vector fetch

The 256 CPU clock cycle delay allows the oscilla-

tor to stabilise and ensures that recovery has tak-

en place from the Reset state.

The RESET vector fetch phase duration is 2 clock

cycles.

If the PLL is enabled by option byte, it outputs the

clock after an additional delay of tSTARTUP (see

Figure 12).

Figure 14. RESET Sequence Phases

Figure 15. Reset Block Diagram

RESET

Active Phase

INTERNAL RESET

256 CLOCK CYCLES

FETCH

VECTOR

RESET

RON

VDD

WATCHDOG RESET

LVD RESET

INTERNAL

RESET

PULSE

GENERATOR

FILTER

ST7LITE05 Datasheet(PDF) 26 Page - STMicroelectronics

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