Zilog Z8F0130 - Manual (Page 137)

eZ8
™
CPU Core
User Manual
UM012820-0810 CP Instruction
122
Escaped Mode Addressing
Using Escaped Mode Addressing, address modes R or IR specify a work-
ing register. If the high nibble of the source or destination address is
Eh
( 1110b ), a working register is inferred. For example, if Working Register
R12 ( Ch ) is the preferred destination operand, use ECh as the destination
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 and Working Register R11
contains the value 20h , the following statement sets the C and S flags,
and clears the Z and V flags:
CP R3, R11

Object Code: A2 3B
If Working Register R15 contains the value 16h , Working Register R10
contains the value 20h , and Register 20h contains 11h , the following
statement clears the C, Z, S, and V flags:
CP R15, @R10

Object Code: A3 FA
If Register 34h contains the value 2Eh and Register 12h contains the
value 1bh , the following statement clears the C, Z, S, and V flags:
CP R1, R2 A4 R2 R1 —
CP R1, @R2 A5 R2 R1 —
CP R1, IM A6 R1 IM —
CP @R1, IM A7 R1 IM —
Mnemonic
Destination,
Source
Op
Code
(Hex)
Operand 1 Operand 2 Operand 3