Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 143)

eZ8

™

CPU Core

User Manual

UM012820-0810 CPCX Instruction

128

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 the value 16h, Register 911h contains the

value

20h and the Carry flag is 1, the following statement sets the C and S

flags, and clears the Z and V flags:

CPCX %AB3, %911



Object Code: 1F A8 91 1A B3

If Register 26Ch contains the value 2Ah, the Carry flag is 0, and the Zero

flag is 0, the following statement sets the Z flag, and clears the C, S, and

V flags:

CPCX

26Ch

, #2Ah



Object Code: 1F A9 2A 02 6C

Mnemonic

Destination,

Source

Code

(Hex) Operand 1 Operand 2 Operand 3

CPCX ER1, ER2 1F A8 ER2[11:4] {ER2[3:0],

ER1[11:8]}

ER1[7:0]

CPCX ER1, IM 1F A9 IM {0h,

ER1[11:8]}

ER1[7:0]

1 2 ... 138 139 140 141 142 143 144 145 146 147 148 ... 313 314

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