ST7MC1K2-Auto datasheet(37/371 Pages) STMICROELECTRONICS

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Central processing unit

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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

●

Enable executing 63 basic instructions

●

Fast 8-bit by 8-bit multiply

●

17 main addressing modes (with indirect addressing mode)

●

Two 8-bit index registers

●

16-bit stack pointer

●

Low power Halt and Wait modes

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Priority maskable hardware interrupts

●

Non-maskable software/hardware interrupts

5.3

CPU registers

The six CPU registers shown in Figure 7 are not present in the memory mapping and are

accessed by specific instructions.

5.3.1

Accumulator (A)

The accumulator is an 8-bit general purpose register used to hold operands and the results

of the arithmetic and logic calculations and to manipulate data.

5.3.2

Index registers (X and Y)

These 8-bit registers are used to create effective addresses or as temporary storage areas

for data manipulation (the cross-assembler generates a precede instruction (PRE) to

indicate that the following instruction refers to the Y register).

The Y register is not affected by the interrupt automatic procedures.

5.3.3

Program counter (PC)

The program counter is a 16-bit register containing the address of the next instruction to be

executed by the CPU. It is made of two 8-bit registers PCL (program counter low which is

the LSB) and PCH (program counter high which is the MSB).

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