Zilog Z8F0130 Manual de usuario descargar pdf (Pagina 272)

eZ8

™

CPU Core

User Manual

UM012820-0810 XORX Instruction

257

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 93Ah contains the value F5h (11110101b) and Register 142h

contains the value

6Ah (01101010b), the following statement leaves the

value

9Fh (10011111b) in Register 93Ah, sets the S flag, and clears the

Z and V flags:

XORX

93Ah

, 1

42h

Object Code: B8 14 29 3A

If Register D7Ah contains the value 07h (00000111b), the following

statement leaves the value

61h (01100001b) in Register 7Ah and clears

the S, Z and V flags:

XORX

D7Ah

, #01100110b



Object Code: B9 66 0D 7A

Mnemonic

Destination,

Source

Op Code

(Hex) Operand 1 Operand 2 Operand 3

XORX ER1, ER2 B8 ER2[11:4] {ER2[3:0],

ER1[11:8]}

ER1[7:0]

XORX ER1, IM B9 IM {0h,

ER1[11:8]}

ER1[7:0]

1 2 ... 267 268 269 270 271 272 273 274 275 276 277 ... 313 314

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