ZiLOG Z8 PLUS User Manual page 117

Instruction Format:
SRP src
Operation:
RP ← src
The specified value is loaded into the Register Pointer (RP) Control Register (FDH). Bits 7-4 determine the
working register group. Bits 3-0 selects the Memory Page. Addressing non-existent working register groups
and memory pages results in undefined behavior.
Table 3-17. Register Pointers, Working Register Groups, and Actual Registers
Register Pointer (FDH)
Contents (Bin)
1111 0000
1110 0000
1101 0000
1100 0000
1011 0000
1010 0000
1001 0000
1000 0000
0111 0000
0110 0000
0101 0000
0100 0000
0011 0000
0010 0000
0001 0000
0000 0000
OPC dst
Working Register Group
OPC (Hex)
31
(Hex)
F
E
D
C
B
A
9
8
7
6
5
4
3
2
1
0
.75
P Â
Set Register Pointer
Address Mod
dst
IM
Actual Registers
(Hex)
F0-FF
E0-EF
D0-DF
C0-CF
B0-BF
A0-AF
90-9F
80-8F
70-7F
60-6F
50-5F
40-4F
30-3F
20-2F
10-1F
00-0F
SRP