Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 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

Eh (1110b), a working

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

Code

(Hex) Operand 1 Operand 2 Operand 3

CALL @RR1 D4 RR1 — —

CALL DA D6 DA[15:8] DA[7:0] —

1 2 ... 123 124 125 126 127 128 129 130 131 132 133 ... 313 314

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