ST7FLUS5MCE View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST7FLUS5MCE

8-bit low cost, low pin-count MCU for automotive, with single voltage Flash memory, ADC, timers

STMicroelectronics 

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ST7LUS5, ST7LU05, ST7LU09

5

Central processing unit

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

solete Prroodduucctt((ss)) 5.3

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Product(s) - Obs 5.3.2

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● 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

CPU registers

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

accessed by specific instructions.

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.

Index registers (X and Y)

In indexed addressing modes, these 8-bit registers are used to create either effective

addresses or 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 (not pushed to and

popped from the stack).

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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