Zilog Z8F0130 - Manual (Page 208)

eZ8
™
CPU Core
User Manual
UM012820-0810 OR Instruction
193
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 R1 contains the value 38h ( 00111000b ) and Work-
ing Register R14 contains the value 8Dh ( 10001101b ), the following
statement leaves the value BDh ( 10111101b ) in Working Register R1,
sets the S flag, and clears the Z and V flags:
OR R1, R14

Object Code: 42 1E
If Working Register R4 contains the value F9h ( 11111001b ), Working
Register R13 contains 7Bh , and Register 7Bh contains the value 6Ah
( 01101010b ), the following statement leaves the value FBh
Mnemonic
Destination,
Source
Op
Code
(Hex)
Operand 1 Operand 2 Operand 3
OR r1, r2 42 {r1, r2} — —
OR r1, @r2 43 {r1, r2} — —
OR R1, R2 44 R2 R1 —
OR R1, @R2 45 R2 R1 —
OR R1, IM 46 R1 IM —
OR @R1, IM 47 R1 IM —