Samsung KS57C2308 Manual page 140

SAM47 INSTRUCTION SET
LDC
— Load Code Byte
LDC dst,src
Operation: Operand
EA,@WX
EA,@EA
Description: This instruction is used to load a byte from program memory into an extended accumulator. The
address of the byte fetched is the 6 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
EA,@WX
EA,@EA
Examples: 1. The following instructions will load one of four values defined by the define byte (DB) directive
to the extended accumulator:
DISPLAY
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.
5-66
Operation Summary
Load code byte from WX to EA
Load code byte from EA to EA
Binary Code
1 1 0 0
1 1 0 0
LD EA,#00H
CALL DISPLAY
JPS MAIN
ORG 0500H
DB 66H
DB 77H
DB 88H
DB 99H
LDC EA,@EA ; EA
RET
1 1 0 0 EA
1 0 0 0
EA
address 0500H = 66H
KS57C2308/P2308/C2316/P2316
Bytes Cycles
1
1
Operation Notation
[PC13–8 + (WX)]
[PC13–8 + (EA)]
3
3