Figure 75. Register Direct - Bit Field Definitions; Figure 76. Register Indirect Addressing - ZiLOG Z8018 Series User Manual

8-bit Register
g or g field ' Register
0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
16-bit Register
zz field Register
0 0
0 1
1 0
1 1
Suffixed H and L ww,xx,yy,zz (ex. wwH,IXL) indicate upper and
lower 8-bit of the 16-bit register respectively.
Figure 75. Register Direct — Bit Field Definitions
Register Indirect (REG)
The memory operand address is contained in one of the 16-bit General
Purpose Registers (BC, DE, and HL) as illustrated in Figure 76.
B C
D E
H L
Figure 76. Register Indirect Addressing
B
C
D
E
H
L
—
A
B C
D E
H L
A F
Family MPU User Manual
ww field Register
0 0 B C
0 1 D E
1 0
H L
1 1
S P
xx field Register
0 0 B C
0 1 D E
I X
1 0
1 1 S P
yy field Register
0 0 B C
0 1 D E
1 0 I Y
1 1
S P
Operand
Memory
UM005004-0918
Z8018x
181