Zilog Z8F0130 User Manual
Page 251

eZ8
™
CPU Core
User Manual
UM012820-0810
SUBX Instruction
236
Attributes
Escaped Mode Addressing
Using Escaped Mode Addressing, address mode ER for the source or des-
tination specifies a working register with 4-bit addressing.
If the high byte of the source or destination address is
EEh
(
11101110b
),
a working register is inferred. For example, the operand
EE3h
selects
Working Register R3. The full 12-bit address is provided by
{RP[3:0],
RP[7:4], 3h}
.
To access registers on Page
Eh
(addresses
E00h
to
EFFh
), set the Page
Pointer, RP[3:0], to
Eh
and set the Working Group Pointer,
RP[7:4]
, to
the preferred Working Group.
Sample Usage
If Register
234h
contains the value
2Eh
, and Register
912h
contains the
value
1Bh
, the following statement leaves the value
13h
in Register
234h
, sets the D flag, and clears the C, Z, S, V, and H flags:
SUBX 234h, 912h
Object Code: 28 91 22 34
If Register
56Ch
contains the value
2Ah
, the following statement leaves
the value
27h
in Register
56Ch
, sets the D flag, and clears the C, Z, S, V,
and H flags:
SUBX 56Ch, #03h
Object Code: 29 03 05 6C
Mnemonic
Destination,
Source
Op
Code
(Hex)
Operand 1 Operand 2 Operand 3
SUBX
ER1, ER2
28
ER2[11:4]
{ER2[3:0],
ER1[11:8]}
ER1[7:0]
SUBX
ER1, IM
29
IM
{0h,
ER1[11:8]}
ER1[7:0]
- Z8F0131 Z8F0230 Z8F0231 Z8F0430 Z8F0431 Z8F043A Z8F0830 Z8F0831 Z8F083A Z8F1232 Z8F1233 Z8F0113 Z8F011A Z8F0123 Z8F012A Z8F0213 Z8F021A Z8F0223 Z8F022A Z8F0411 Z8F0412 Z8F0413 Z8F041A Z8F0421 Z8F0422 Z8F0423 Z8F042A Z8F0811 Z8F0812 Z8F0813 Z8F081A Z8F0821 Z8F0822 Z8F0823 Z8F082A Z8F0880 Z8F1621 Z8F1622 Z8F1680 Z8F1681 Z8F1682 Z8F2421 Z8F2422 Z8F2480 Z8F3221 Z8F3222 Z8F3281 Z8F3282 Z8F4821 Z8F4822 Z8F4823 Z8F6081 Z8F6082 Z8F6421 Z8F6422 Z8F6423 Z8F6481 Z8F6482 Z8FS021A ZMOT1AHH Z8FS040B ZMOT0BHH ZMOT0BSB Z8FMC04 Z8FMC08 Z8FMC16