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INSTRUCTION SET S3C84E5/C84E9/P84E9
6-16
AND — Logical AND
AND dst,src
Operation: dst ← dst AND src
The source operand is logically ANDed with the destination operand. The result is stored in the
destination. The AND operation causes a "1" bit to be stored whenever the corresponding bits in the
two operands are both logic ones; otherwise a "0" bit value is stored. The contents of the source are
unaffected.
Flags: C: Unaffected.
Z: Set if the result is "0"; cleared otherwise.
S: Set if the result bit 7 is set; cleared otherwise.
V: Always cleared to "0".
D: Unaffected.
H: Unaffected.
Format:
Bytes Cycles Opcode
(Hex)
Addr Mode
dst src
opc dst | src 2 4 52 r r
6 53 r lr
opc src dst 3 6 54 R R
55 R IR
opc dst src 3 6 56 R IM
Examples: Given: R1 = 12H, R2 = 03H, register 01H = 21H, register 02H = 03H, register 03H = 0AH:
AND R1,R2 → R1 = 02H, R2 = 03H
AND R1,@R2 → R1 = 02H, R2 = 03H
AND 01H,02H → Register 01H = 01H, register 02H = 03H
AND 01H,@02H → Register 01H = 00H, register 02H = 03H
AND 01H,#25H → Register 01H = 21H
In the first example, the destination working register R1 contains the value 12H and the source
working register R2 contains 03H. The statement "AND R1,R2" logically ANDs the source
operand 03H with the destination operand value 12H, leaving the value 02H in the register R1.