68HC12 查看數據表（PDF） - Motorola => Freescale

零件编号

产品描述 (功能)

生产厂家

68HC12

16-bit microcontroller unit (MCU)

Motorola => Freescale 

Central Processing Unit

Central Processing Unit

Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Programming Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Data Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Addressing Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Indexed Addressing Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Opcodes and Operands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Introduction

The CPU12 is a high-speed, 16-bit processing unit. It has full 16-bit data

paths and wider internal registers (up to 20 bits) for high-speed extended

math instructions. The instruction set is a proper superset of the

M68HC11instruction set. The CPU12 allows instructions with odd byte

counts, including many single-byte instructions. This provides efficient

use of ROM space. An instruction queue buffers program information so

the CPU always has immediate access to at least three bytes of machine

code at the start of every instruction. The CPU12 also offers an

extensive set of indexed addressing capabilities.

Programming Model

CPU12 registers are an integral part of the CPU and are not addressed

as if they were memory locations.

1-cpu

MOTOROLA

Central Processing Unit

68HC(9)12DG128 Rev 1.0

17

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