ST7FOXU0 datasheet(21/123 Pages) STMICROELECTRONICS

21 / 123 page

ST7FOXU0

Central processing unit

21/123

Central processing unit

5.1

Introduction

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

bit data manipulation.

5.2

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

5.3

CPU registers

The six CPU registers shown in Figure 5. They are not present in the memory mapping and

are accessed by specific instructions.

Figure 5.

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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