Zilog Z8F0130 - Manual (Page 253)

eZ8
™
CPU Core
User Manual
UM012820-0810 SWAP Instruction
238
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 Register BCh contains the value B3h ( 10110011b ), the following state-
ment leaves the value 3Bh ( 00111011b ) in Register BCh and clears the Z
and S flags:
SWAP BCh

Object Code: F0 BC
If Working Register R5 contains the value BCh and Register BCh contains
the value B3h ( 10110011b ), the following statement leaves the value
3Bh ( 00111011b ) in Register BCh and clears the Z and S flags:
SWAP @R5h

Object Code: F1 E5