Zilog Z8F0130 Manuel d'utilisateur télécharger pdf (Page 251)

eZ8

™

CPU Core

User Manual

UM012820-0810 SUBX Instruction

236

Attributes

Escaped Mode Addressing

Using Escaped Mode Addressing, address mode ER for the source or des-

tination specifies 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 234h contains the value 2Eh, and Register 912h contains the

value

1Bh, the following statement leaves the value 13h in Register

234h, sets the D flag, and clears the C, Z, S, V, and H flags:

SUBX

234h

912h

Object Code: 28 91 22 34

If Register 56Ch contains the value 2Ah, the following statement leaves

the value

27h in Register 56Ch, sets the D flag, and clears the C, Z, S, V,

and H flags:

SUBX

56Ch

, #03h



Object Code: 29 03 05 6C

Mnemonic

Destination,

Source

Code

(Hex) Operand 1 Operand 2 Operand 3

SUBX ER1, ER2 28 ER2[11:4] {ER2[3:0],

ER1[11:8]}

ER1[7:0]

SUBX ER1, IM 29 IM {0h,

ER1[11:8]}

ER1[7:0]

1 2 ... 246 247 248 249 250 251 252 253 254 255 256 ... 313 314

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Zilog Z8F0130 Manuel d'utilisateur Page 251

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