Zilog Z8F0130 - Manual (Page 269)

eZ8
™
CPU Core
User Manual
UM012820-0810 XOR Instruction
254
Attributes
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 R1 contains the value 38h ( 00111000b ) and Work-
ing Register R14 contains the value 8Dh ( 10001101b ), the following
statement leaves the value B5h ( 10110101b ) in Working Register R1,
sets the S flag, and clears the Z and V flags:
XOR R1, R14

Object Code: B2 1E
If Working Register R4 contains the value F9h ( 11111001b ), Working
Register R13 contains the value 7Bh , and Register 7Bh contains the value
6Ah ( 01101010b ), the following statement leaves the value 93h
Mnemonic
Destination,
Source
Op
Code
(Hex)
Operand 1 Operand 2 Operand 3
XOR r1, r2 B2 {r1, r2} — —
XOR r1, @r2 B3 {r1, r2} — —
XOR R1, R2 B4 R2 R1 —
XOR R1, @R2 B5 R2 R1 —
XOR R1, IM B6 R1 IM —
XOR @R1, IM B7 R1 IM —