Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 258)

eZ8

™

CPU Core

User Manual

UM012820-0810 TCMX Instruction

243

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 DD4h contains the value 04h (00000100b), and Register

420h contains the value 80h (10000000b) (testing bit 7 if it is 1), the fol-

lowing statement resets the Z flag (because bit 7 in the destination oper-

and is not a 1), sets the S flag, and clears the V flag.

TCMX

DD4h

420h

Object Code: 68 42 0D D4

If Register B52h contains the value F2h (11110010b), the following

statement tests bit 1 of the destination operand for 1, sets the Z flag (indi

cating bit 1 in the destination operand is 1) and clears the S and V flags:

TCMX

B52h

, #02h



Object Code: 66 02 0b 52

Mnemonic

Destination,

Source

Op Code

(Hex) Operand 1 Operand 2 Operand 3

TCMX ER1, ER2 68 ER2[11:4] {ER2[3:0],

ER1[11:8]}

ER1[7:0]

TCMX ER1, IM 69 IM {0h,

ER1[11:8]}

ER1[7:0]

1 2 ... 253 254 255 256 257 258 259 260 261 262 263 ... 313 314

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