Zilog Z8F0130 - Manual (Page 219)

eZ8
™
CPU Core
User Manual
UM012820-0810 PUSHX Instruction
204
Attributes
Escaped Mode Addressing
Using Escaped Mode Addressing, address mode ER can specify a work-
ing 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 the Stack Pointer contains D24h, the following statement stores the
contents of Register
FCAh in location D23h :
PUSHX FCAh

Object Code: C8 FC A0
After the PUSHX operation, the Stack Pointer contains the value D23h .
Mnemonic Source
Op Code
(Hex)
Operand 1 Operand 2 Operand 3
PUSHX ER2 C8 ER2[11:4] {ER2[3:0],
0h} —