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eZ8

™

CPU Core

User Manual

UM012820-0810 XOR Instruction

254

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

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

statement leaves the value

B5h (10110101b) in Working Register R1,

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

XOR R1, R14



Object Code: B2 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 93h

Mnemonic

Destination,

Source

Code

(Hex) Operand 1 Operand 2 Operand 3

XOR r1, r2 B2 {r1, r2} — —

XOR r1, @r2 B3 {r1, r2} — —

XOR R1, R2 B4 R2 R1 —

XORR1, @R2B5R2R1—

XOR R1, IM B6 R1 IM —

XOR @R1, IM B7 R1 IM —

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Zilog Z8F0130 Bedienungsanleitung Seite 269