Zilog Z8F0130 - Manual (Page 181)

eZ8
™
CPU Core
User Manual
UM012820-0810 LD Instruction
166
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
The following statement loads the value 34h into Working Register R15.
LD R15, #34h

Object Code: FC 34
If Register 34h contains the value FCh , the following statement loads the
value FCh into Working Register R14.
LD R14, 34h

Object Code: E4 34 EE
The contents of Register 34h are not affected.
If Working Register R14 contains the value 45h , the following statement
loads the value 45h into Register 34h :
LD 34h, R14

Object Code: E4 EE 34
The contents of Working Register R14 are not affected.
If Working Register R12 contains the value 34h , and Register 34h con-
tains the value FFh , the following statement loads the value FFh into
Working Register R13:
LD R13, @R12

Object Code: E3 DC
The contents of Working Register R12 and Register R34 are not affected.