Zilog Z8F0130 - Manual (Page 135)

eZ8
™
CPU Core
User Manual
UM012820-0810 COM Instruction
120
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 08h contains 24h ( 00100100b ), the following statement
leaves the value DBh ( 11011011b ) in Register 08h , sets the S flag, and
clears the Z and V flags:
COM 08h

Object Code: 60 08
If Register 08h contains the value 24h , and Register 24h contains the
value FFh ( 11111111b ), the following statement leaves the value 00h
( 00000000b ) in Register 24h , sets the Z flag is set and clears the V and S
flags:
COM @08h

Object Code: 61 08