Zilog Z8F0130 - Manual (Page 128)

eZ8
™
CPU Core
User Manual
UM012820-0810 CALL Instruction
113
Attributes
Escaped Mode Addressing
Using Escaped Mode Addressing, address mode IR specifies a working
register. If the destination address is prefixed by
Eh ( 1110b ), a working
register is inferred. For example, if Working Register R12 ( Ch ) is the pre-
ferred destination operand, use ECh as the destination operand in the Op
Code. To access registers with addresses E0h to EFh , either set the Work-
ing Group Pointer, RP[7:4] , to Eh or use indirect addressing.
Sample Usage
If the contents of the Program Counter are 1A47h and the contents of the
Stack Pointer are 3002h , the following statement causes the Stack Pointer
to be decremented to 3000h , 1A4Ah (the address following the CALL
instruction) to be stored in Program Memory locations 3001h and 3000h ,
and the Program Counter to be loaded with 3521h :
CALL 3521h

Object Code: D6 35 21
The Program Counter now points to the address of the first statement in
the called procedure to be executed. The flags are unaffected.
If the contents of Program Counter are 1A47h and the contents of the
Stack Pointer are 3724h , the contents of Register A4h are 34h , and the
contents of the Register Pair 34h are 3521h , the following statement
causes the Stack Pointer to decrement to 3722h , stores 1A4Ah (the
address following the CALL instruction) in Program Memory locations
3723h and 3722h, and loads the Program Counter with
3521h :
Mnemonic Destination
Op
Code
(Hex)
Operand 1 Operand 2 Operand 3
CALL @RR1 D4 RR1 — —
CALL DA D6 DA[15:8] DA[7:0] —