MPU-3

5.One condition code register (CC)

6.72 instructions

7.Five addressing modes

8.System clock range of 100 kilohertz to 1 megahertz

9.Program interrupt capability

Accumulators

The MPU contains 2 accumulators designated ACCA and ACCB. Each accumulator is 8 bits (one byte) long and is used to hold operands and data from the arithmetic logic unit. Instructions which involve one or both accumulators are:

ABA - Add accumulator A to accumulator B

ADC - Add with carry

ADD - Add without carry

AND - Logical AND

ASL - Arithmetic shift left

ASR - Arithmetic shift right

BIT - Bit test

CBA - Compare accumulators

CLR - Clear

CMP - Compare

COM - Complement

DAA - Decimal adjust ACCA

DEC - Decrement

EOR - Exclusive OR