Accumulator; Accumulators - NEC PD75402A User Manual

4.5

ACCUMULATOR

In the PD75402A, the A register and the XA register pair function as accumulators. The 4-bit data process
instruction is executed mainly by the A register and the 8-bit data process instruction is executed mainly by the XA
register pair.
In the bit manipulation instruction, the carry flag (CY) functions as the bit accumulator.
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CHAPTER 4. INTERNAL CPU FUNCTIONS
Fig. 4-6 Accumulators
CY
A
X
A
Bit Accumulator
4-Bit Accumulator
8-Bit Accumulator