HCS08 datasheet(91/316 Pages) NXP

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MC9S08SG8 MCU Series Data Sheet, Rev. 8

Freescale Semiconductor

Chapter 7



Central Processor Unit (S08CPUV2)

7.1

Introduction

This section provides summary information about the registers, addressing modes, and instruction set of

the CPU of the HCS08 Family. For a more detailed discussion, refer to the HCS08 Family Reference

Manual, volume 1, Freescale Semiconductor document order number HCS08RMV1/D.

The HCS08 CPU is fully source- and object-code-compatible with the M68HC08 CPU. Several

instructions and enhanced addressing modes were added to improve C compiler efficiency and to support

a new background debug system which replaces the monitor mode of earlier M68HC08 microcontrollers

(MCU).

7.1.1

Features

Features of the HCS08 CPU include:

•

Object code fully upward-compatible with M68HC05 and M68HC08 Families

•

All registers and memory are mapped to a single 64-Kbyte address space

•

16-bit stack pointer (any size stack anywhere in 64-Kbyte address space)

•

16-bit index register (H:X) with powerful indexed addressing modes

•

8-bit accumulator (A)

•

Many instructions treat X as a second general-purpose 8-bit register

•

Seven addressing modes:

— Inherent — Operands in internal registers

— Relative — 8-bit signed offset to branch destination

— Immediate — Operand in next object code byte(s)

— Direct — Operand in memory at 0x0000–0x00FF

— Extended — Operand anywhere in 64-Kbyte address space

— Indexed relative to H:X — Five submodes including auto increment

— Indexed relative to SP — Improves C efficiency dramatically

•

Memory-to-memory data move instructions with four address mode combinations

•

Overflow, half-carry, negative, zero, and carry condition codes support conditional branching on

the results of signed, unsigned, and binary-coded decimal (BCD) operations

•

Efficient bit manipulation instructions

•

Fast 8-bit by 8-bit multiply and 16-bit by 8-bit divide instructions

•

STOP and WAIT instructions to invoke low-power operating modes

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