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S3C72G9 Datasheet(PDF) 68 Page - Samsung semiconductor

Part # S3C72G9
Description  SAM47 INSTRUCTION SET
Download  96 Pages
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Manufacturer  SAMSUNG [Samsung semiconductor]
Direct Link  http://www.samsung.com/Products/Semiconductor
Logo SAMSUNG - Samsung semiconductor

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 % %'"'
LDC
dst,src
Operation:
Operand
Operation Summary
Bytes
Cycles
EA,@WX
Load code byte from WX to EA
1
3
EA,@EA
Load code byte from EA to EA
1
3
Description:
This instruction is used to load a byte from program memory into an extended accumulator. The
address of the byte fetched is the six highest bit values in the program counter and the contents of
an 8-bit working register (either WX or EA). The contents of the source are unaffected.
Operand
Binary Code
Operation Notation
EA,@WX
1
1
0
0
1
1
0
0
EA
← [PC14-8 + (WX)]
EA,@EA
1
1
0
0
1
0
0
0
EA
← [PC14-8 + (EA)]
Examples:
1. The following instructions will load one of four values defined by the define byte (DB) directive
to the extended accumulator:
LD
EA,#00H
CALL
DISPLAY
JPS
MAIN
ORG
0500H
DB
66H
DB
77H
DB
88H
DB
99H
DISPLAY
LDC
EA,@EA ; EA
← address 0500H = 66H
RET
If the instruction 'LD EA,#01H' is executed in place of 'LD EA,#00H', The content of 0501H
(77H) is loaded to the EA register. If 'LD EA,#02H' is executed, the content of address 0502H
(88H) is loaded to EA.


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