ST7LITE49K2 datasheet(33/245 Pages) STMICROELECTRONICS

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ST7LITE49K2

Central processing unit

33/245

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

1 1 HI

RESET VALUE = RESET VECTOR @ FFFEh-FFFFh

PCH

PCL

RESET VALUE = STACK HIGHER ADDRESS

RESET VALUE = 1X

11 X 1 X X

RESET VALUE = XXh

X = Undefined Value

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