Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 93)

eZ8

™

CPU Core

User Manual

UM012820-0810 ADCX Instruction

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 634h contains the value 2Eh, the Carry flag is set, and Regis-

ter B12h contains the value 1bh, the following statement leaves the value

4Ah in Register 634h, sets the H flag, and clears the C, Z, S, V, and D

flags:

ADCX

634h

B12h

Object Code: 18 B1 26 34

Using Escaped Mode Addressing, if Working Register R4 contains the

value

2Eh, the Carry flag is set, and Register B12h contains the value

1bh, the following statement leaves the value 4Ah in Working Register

R4, sets the H flag, and clears the C, Z, S, V, and D flags:

Mnemonic

Destination,

Source

Code

(Hex) Operand 1 Operand 2 Operand 3

ADCX ER1, ER2 18 ER2[11:4] {ER2[3:0],

ER1[11:8]}

ER1[7:0]

ADCX ER1, IM 19 IM {0h,

ER1[11:8]}

ER1[7:0]

1 2 ... 88 89 90 91 92 93 94 95 96 97 98 ... 313 314

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