Samsung S3C9454B User Manual page 81

SAM88RCRI INSTRUCTION SET
ADD
— Add
ADD dst,src
dst ← dst + src
Operation:
The source operand is added to the destination operand and the sum is stored in the destination.
The contents of the source are unaffected. Two's-complement addition is performed.
Flags: C: Set if there is a carry from the most significant bit of the result; cleared otherwise.
Z: Set if the result is "0"; cleared otherwise.
S: Set if the result is negative; cleared otherwise.
V: Set if arithmetic overflow occurred, that is, if both operands are of the same sign and the result is
of the opposite sign; cleared otherwise.
Format:
opc
opc
opc
Examples: Given: R1 = 12H, R2 = 03H, register 01H = 21H, register 02H = 03H, register 03H = 0AH:
ADD
ADD
ADD
ADD
ADD
In the first example, destination working register R1 contains 12H and the source working register
R2 contains 03H. The statement "ADD R1,R2" adds 03H to 12H, leaving the value 15H in register
R1.
6-12
dst | src
src dst
dst src
→
R1,R2 R1 = 15H, R2 = 03H
→
R1,@R2 R1 = 1CH, R2 = 03H
→
01H,02H Register 01H = 24H, register 02H = 03H
→
01H,@02H Register 01H = 2BH, register 02H = 03H
→
01H,#25H Register 01H = 46H
Bytes Cycles Opcode
2 4
6
3 6
6
3 6
S3C9454B/F9454B
Addr Mode
(Hex) dst src
02 r r
03 r lr
04 R R
05 R IR
06 R IM