Zilog Z8F0130 - Manual (Page 140)

eZ8
™
CPU Core
User Manual
UM012820-0810 CPC Instruction
125
Attributes
Escaped Mode Addressing
Using Escaped Mode Addressing, address modes R or IR can specify a
working register. If the high nibble of the source or destination address is
Eh ( 1110b ), a working register is inferred. For example, if Working Reg-
ister R12 ( Ch ) is the preferred destination operand, use ECh as the destina-
tion operand in the Op Code. To access registers with addresses E0h to
EFh , either set the Working Group Pointer, RP[7:4] , to Eh or use indirect
addressing.
Sample Usage
If Working Register R3 contains the value 16h , Working Register R11
contains the value 20h and the Carry flag is 1, the following statement
sets the C and S flags, and clears the Z and V flags:
CPC R3, R11

Object Code: 1F A2 3B
If Working Register R15 contains the value 16h , Working Register R10
contains the value 20h , Register 20h contains the value 11h and the
Carry flag is 0, the following statement clears the C, Z, S, and V flags:
Mnemonic
Destination,
Source
Op
Code
(Hex)
Operand 1 Operand 2 Operand 3
CPC r1, r2 1F A2 {r1, r2} — —
CPC r1, @r2 1F A3 {r1, r2} — —
CPC R1, R2 1F A4 R2 R1 —
CPC R1, @R2 1F A5 R2 R1 —
CPC R1, IM 1F A6 R1 IM —
CPC @R1, IM 1F A7 R1 IM —