Zilog Z8F0130 Manual de usuario descargar pdf (Pagina 211)

eZ8

™

CPU Core

User Manual

UM012820-0810 ORX Instruction

196

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

contains the value

0Ah (00001010b), the following statement leaves the

value

FFh (11111111b) in Register 93Ah, sets the S flag, and clears the

Z and V flags:

ORX

93Ah

, 1

42h

Object Code: 48 14 29 3A

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

statement leaves the value

67h (01100111b) in Register D7Ah and clears

the S, Z, and V flags:

ORX

D7Ah

, #01100000b



Object Code: 49 60 0D 7A

Mnemonic

Destination,

Source

Op Code

(Hex) Operand 1 Operand 2 Operand 3

ORX ER1, ER2 48 ER2[11:4] {ER2[3:0],

ER1[11:8]}

ER1[7:0]

ORX ER1, IM 49 IM {0h,

ER1[11:8]}

ER1[7:0]

1 2 ... 206 207 208 209 210 211 212 213 214 215 216 ... 313 314

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Zilog Z8F0130 Manual de usuario Pagina 211

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