2 general-purpose registers – NEC switch User Manual
Page 43
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CHAPTER 3 CPU ARCHITECTURE
User’s Manual U12978EJ3V0UD
43
3.2.2 General-purpose registers
The general-purpose registers consist of eight 8-bit registers (X, A, C, B, E, D, L, and H).
In addition that each register can be used as an 8-bit register, two 8-bit registers in pairs can be used as a 16-bit
register (AX, BC, DE, and HL).
They can be described in terms of functional names (X, A, C, B, E, D, L, H, AX, BC, DE, and HL) and absolute
names (R0 to R7 and RP0 to RP3).
Figure 3-10. Configuration of General-Purpose Registers
(a) Absolute names
R0
15
0
7
0
16-bit processing
8-bit processing
RP3
RP2
RP1
RP0
R1
R2
R3
R4
R5
R6
R7
(b) Functional names
X
15
0
7
0
16-bit processing
8-bit processing
HL
DE
BC
AX
A
C
B
E
D
L
H
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