Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 208)

eZ8

™

CPU Core

User Manual

UM012820-0810 OR Instruction

193

Attributes

Escaped Mode Addressing

Using Escaped Mode Addressing, address modes R or IR can specify a

working register. If the high nibble of the source or destination address is

Eh (1110b), a working register is inferred. For example, if Working Reg-

ister R12 (Ch) is the preferred destination operand, use ECh as the destina-

tion operand in the Op Code. To access registers with addresses E0h to

EFh, either set the Working Group Pointer, RP[7:4], to Eh or use indirect

addressing.

Sample Usage

If Working Register R1 contains the value 38h (00111000b) and Work-

ing Register R14 contains the value 8Dh (10001101b), the following

statement leaves the value

BDh (10111101b) in Working Register R1,

sets the S flag, and clears the Z and V flags:

OR R1, R14



Object Code: 42 1E

If Working Register R4 contains the value F9h (11111001b), Working

7Bh, and Register 7Bh contains the value 6Ah

(

01101010b), the following statement leaves the value FBh

Mnemonic

Destination,

Source

Code

(Hex) Operand 1 Operand 2 Operand 3

OR r1, r2 42 {r1, r2} — —

OR r1, @r2 43 {r1, r2} — —

OR R1, R2 44 R2 R1 —

ORR1, @R245R2R1—

OR R1, IM 46 R1 IM —

OR @R1, IM 47 R1 IM —

1 2 ... 203 204 205 206 207 208 209 210 211 212 213 ... 313 314

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Zilog Z8F0130 Manual do Utilizador Página 208