Zilog Z8F0130 - Manual (Page 229)

eZ8
™
CPU Core
User Manual
UM012820-0810 RR Instruction
214
Attributes
Escaped Mode Addressing
Using Escaped Mode Addressing, address modes R or IR can specify a
working register. If the destination address is prefixed by
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 R6 contains the value 31h ( 00110001b ), the follow-
ing statement leaves the value 98h ( 10011000b ) in Working Register R6,
sets the C, V, and S flags, and clears the Z flag.
RR R6

Object Code: E0 E6
If Register C6h contains the value 31h and Register 31h contains the
value 7Eh ( 01111110b ), the following statement leaves the value 3Fh
( 00111111b ) in Register 31h and clears the C, Z, V, and S flags:
RR @C6h

Object Code: E1 C6
Mnemonic Destination
Op
Code
(Hex)
Operand 1 Operand 2 Operand 3
RR R1 E0 R1 — —
RR @R1 E1 R1 — —