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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
One condition code register (CC)
72 instructions
Five addressing modes
System clock range of 100 kilohertz to 1 megahertz
Program interrupt capability
MPU-3
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