Zilog Z8F0130 Manual de usuario descargar pdf (Pagina 145)

eZ8

™

CPU Core

User Manual

UM012820-0810 CPX Instruction

130

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 AB3h contains 16h and Register 911h contains 20h, the fol-

lowing statement sets the C and S flags, and clears the Z and V flags:

CPX %AB3, %911



Object Code: A8 3B

If Register 26Ch contains 2Ah, the following statement sets the Z flag,

and clears the C, S, and V flags:

CPX

26Ch

, #2Ah



Object Code: A9 6C 2A

Mnemonic

Destination,

Source

Code

(Hex) Operand 1 Operand 2 Operand 3

CPX ER1, ER2 A8 ER2[11:4] {ER2[3:0],

ER1[11:8]}

ER1[7:0]

CPX ER1, IM A9 IM {0h,

ER1[11:8]}

ER1[7:0]

1 2 ... 140 141 142 143 144 145 146 147 148 149 150 ... 313 314

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