Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 248)

eZ8

™

CPU Core

User Manual

UM012820-0810 SUB Instruction

233

Attributes

Escaped Mode Addressing

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

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

(

1110b), a working register is inferred. For example, if Working Register

R12 (

Ch) is the preferred destination operand, use ECh as the destination

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 R3 contains the value 16h, and Working Register

R11 contains the value

20h, the following statement leaves the value F6h

in Working Register R3, sets the C, S, and D flags and clears the Z, V, and

H flags:

SUB R3, R11



Object Code: 22 3B

If Working Register R15 contains the value 16h, Working Register R10

contains the value

20h, and Register 20h contains the value 11h, the fol-

lowing statement leaves the value 05h in Working Register R15:

Mnemonic

Destination,

Source

Code

(Hex) Operand 1 Operand 2 Operand 3

SUB r1, r2 22 {r1, r2} — —

SUB r1, @r2 23 {r1, r2} — —

SUB R1, R2 24 R2 R1 —

SUBR1, @R225R2R1—

SUB R1, IM 26 R1 IM —

SUB @R1, IM 27 R1 IM —

1 2 ... 243 244 245 246 247 248 249 250 251 252 253 ... 313 314

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