ST7LITE49M datasheet(29/188 Pages) STMICROELECTRONICS

Part #	ST7LITE49M

Description	8-bit MCU with single voltage Flash memory data EEPROM, ADC, 8/12-bit timers, and I²C interface

PDF	188 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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29 / 188 page

ST7LITE49M

Central processing unit

29/188

Central processing unit

6.1

Introduction

This CPU has a full 8-bit architecture and contains six internal registers allowing efficient 8-

bit data manipulation.

6.2

Main features

●

63 basic instructions

●

Fast 8-bit by 8-bit multiply

●

17 main addressing modes

●

Two 8-bit index registers

●

16-bit stack pointer

●

Low power modes

●

Maskable hardware interrupts

●

Non-maskable software interrupt

6.3

CPU registers

The six CPU registers shown in Figure 10. They are not present in the memory mapping

and are accessed by specific instructions.

Figure 10.

CPU registers

ACCUMULATOR

X INDEX REGISTER

Y INDEX REGISTER

STACK POINTER

CONDITION CODE REGISTER

PROGRAM COUNTER

11 H I

N Z

RESET VALUE = RESET VECTOR @ FFFEh-FFFFh

PCH

PCL

RESET VALUE = STACK HIGHER ADDRESS

RESET VALUE = 1X

11X 1X X

RESET VALUE = XXh

X = Undefined Value

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