PS081 datasheet(104/155 Pages) AMSCO

104 / 155 page

acam-messelectronic gmbh - Friedrich-List-Str.4 - D-76297 Stutensee-Blankenloch - Germany - www.acam.de

6-1

PSØ81

Table of Contents

Page

Central Processing Unit (CPU)............................................................ 6-2

6.1

Block Diagram.........................................................................................................................................6-2

6.2

Memory Organization ...............................................................................................................................6-2

6.2.1

ROM and EEPROM Organization .....................................................................................................6-2

6.2.2

RAM Organization .........................................................................................................................6-3

6.2.3

RAM Address Pointer ...................................................................................................................6-4

6.2.4

Arithmetic Logic Unit (ALU) ............................................................................................................6-4

6.2.5

Accumulators................................................................................................................................6-4

6.2.6

Flags............................................................................................................................................6-4

6.3

Status and Result Registers .....................................................................................................................6-5

6.3.1

Result Registers ...........................................................................................................................6-5

6.3.2

Status Register.............................................................................................................................6-7

6.4

Instruction Set ........................................................................................................................................6-8

6.4.1

Branch instructions .......................................................................................................................6-8

6.4.2

Arithmetic operations ....................................................................................................................6-8

6.5

System Reset, Sleep Mode and Auto-configuration....................................................................................6-34

6.5.1

Power On Reset ..........................................................................................................................6-34

6.5.2

Watchdog Reset .........................................................................................................................6-34

6.5.3

External Reset on Pin 27..............................................................................................................6-34

6.5.4

Sleep Mode ................................................................................................................................6-35

6.5.5

CPU Clock Generation ..................................................................................................................6-36

6.5.6

Watchdog Counter and Single Conversion Counter ..........................................................................6-36

6.5.7

Timer .........................................................................................................................................6-36

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