ST7FLITE25F2M6 datasheet(20/133 Pages) STMICROELECTRONICS

20 / 133 page

ST7LITE2

20/133

6 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 6 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 reg-

ister 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 in-

struction (PRE) to indicate that the following in-

struction refers to the Y register.)

The Y register is not affected by the interrupt auto-

matic 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).

Figure 10. 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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