DP8344 datasheet(155/184 Pages) NSC

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60 Reference Section (Continued)

XOR

Exclusive OR Immediate

Syntax

XOR n rsd

immediate limited register

Affected Flags

N Z

Description

Logically exclusive ORs the immediate value n to the regis-

ter rsd and places the result back into the register rsd Note

that only the active registers R0 – R15 may be specified for

rsd The value of n is 8 bits wide

Example

Encodedecode a data byte in register 15

XOR

code

pattern R15

encodedecode

Instruction Format

0110

Opcode

rsd

T-states

Bus Timing

Figure 6-1

Operation

rsd XOR n

xrsd

XORA

Exclusive OR with Accumulator

Syntax

XORA

Rs Rd

XORA

mlr

Affected Flags

N Z

Description

Logically exclusive ORs the source register Rs to the active

accumulator and places the result into the destination speci-

fied The destination may be either a register Rd or data

memory via an index register mode mlr Note that register

bank selection determines which accumulator is active

Example

Decode the data byte just received and place it into data

memory This example assumes that the accumulator con-

tains the ‘‘key’’ and that the index register IY points to the

location where the information should be stored

EXX

select alternate banks

XORA

RTR

IYa

decode received byte and

save it

Instruction Format

XORA Rs Rd

111110

Opcode

XORA Rs

mlr

TLF9336 – 18

T-states

XORA Rs Rd

XORA Rs

mlr

Bus Timing

XORA Rs Rd

Figure 6-1

XORA Rs

mlr

Figure 6-7

Operation

XORA Rs Rd

Rs XOR accumulator

xRd

XORA Rs

mlr

Rs XOR accumulator

xdata memory

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