MC68HC705P9CS datasheet(44/160 Pages) FREESCALE

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Central Processor Unit (CPU)

Technical Data

MC68HC705P9 — Rev. 4.0

Central Processor Unit (CPU)

MOTOROLA

4.2 Features

Features include:

•

2.1-MHz bus frequency

•

8-bit accumulator

•

8-bit index register

•

13-bit program counter

•

6-bit stack pointer

•

Condition code register with five status flags

•

62 instructions

•

Eight addressing modes

•

Power-saving stop, wait, and data-retention modes

4.3 Introduction

The central processor unit (CPU) consists of a CPU control unit, an

arithmetic/logic unit (ALU), and five CPU registers. The CPU control unit

fetches and decodes instructions. The ALU executes the instructions.

The CPU registers contain data, addresses, and status bits that reflect

the results of CPU operations.

4.4 CPU Control Unit

The CPU control unit fetches and decodes instructions during program

operation. The control unit selects the memory locations to read and

write and coordinates the timing of all CPU operations.

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