Zilog Z8F0130 - Manual (Page 143)

eZ8
™
CPU Core
User Manual
UM012820-0810 CPCX Instruction
128
Attributes
Escaped Mode Addressing
Using Escaped Mode Addressing, address mode ER for the source or des-
tination can specify 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 AB3h contains the value 16h , Register 911h contains the
value 20h and the Carry flag is 1, the following statement sets the C and S
flags, and clears the Z and V flags:
CPCX %AB3, %911

Object Code: 1F A8 91 1A B3
If Register 26Ch contains the value 2Ah , the Carry flag is 0, and the Zero
flag is 0, the following statement sets the Z flag, and clears the C, S, and
V flags:
CPCX 26Ch, #2Ah

Object Code: 1F A9 2A 02 6C
Mnemonic
Destination,
Source
Op
Code
(Hex)
Operand 1 Operand 2 Operand 3
CPCX ER1, ER2 1F A8 ER2[11:4] {ER2[3:0],
ER1[11:8]} ER1[7:0]
CPCX ER1, IM 1F A9 IM {0h,
ER1[11:8]} ER1[7:0]