Zilog Z8F0130 - Manual (Page 89)

eZ8
™
CPU Core
User Manual
UM012820-0810 ADC Instruction
74
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
Example 1
If Working Register R3 contains the value 16h , the Carry flag is 1, and
Working Register R11 contains the value 20h , the following statement
leaves the value 37h in Working Register R3 and clears the C, Z, S, V, D,
and H flags:
ADC R3, R11

Object Code: 12 3B
Mnemonic
Destination,
Source
Op
Code
(Hex)
Operand 1 Operand 2 Operand 3
ADC r1, r2 12 {r1, r2} — —
ADC r1, @r2 13 {r1, r2} — —
ADC R1, R2 14 R2 R1 —
ADC R1, @R2 15 R2 R1 —
ADC R1, IM 16 R1 IM —
ADC @R1, IM 17 R1 IM —