General Register; General Register Configuration; Register Pair Configuration - NEC PD75402A User Manual

4.4

GENERAL REGISTER ..... 4

The general register is assigned to a specific address of the data memory. There are four 4-bit registers (H, L,
X, A).
While each general register is operated per 4 bits, HL and XA make up register pairs, each of which is operated
per 8 bits. The HL register pair is available as the data pointer to indirectly address the memory.
The general register area can be addressed and accessed as an ordinary RAM regardless of whether it is used
as a register or not.
Remarks The figure in the lower right corner is the assigned data memory address.
CHAPTER 4. INTERNAL CPU FUNCTIONS
4 BITS
Fig. 4-4 General Register Configuration
X
0 1 H
H
0 3 H
Fig. 4-5 Register Pair Configuration
3 0
H
3 0
X
A
0 0 H
L
0 2 H
3 0
L
3 0
A
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