ST7FOXA0 datasheet(21/123 Pages) STMICROELECTRONICS

Il numero della parte	ST7FOXA0

Spiegazioni elettronici	8-bit MCU with single voltage Flash memory

PDF	123 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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21 / 123 page

ST7FOXA0

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

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Low power modes

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Maskable hardware interrupts

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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

Obsolete

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