STC89C53RC datasheet(44/165 Pages) STC

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ANL <dest-byte> , <src-byte>

Function:

Logical-AND for byte variables

Description:

ANL performs the bitwise logical-AND operation between the variables indicated and stores

the results in the destination variable. No flags are affected.

The two operands allow six addressing mode combinations. When the destination is the

Accumulator, the source can use register, direct, register-indirect, or immediate addressing;

when the destination is a direct address, the source can be the Accumulator or immediate

data.

Note: When this instruction is used to modify an output port, the value used as the original

port data will be read from the output data latch not the input pins.

Example:

If the Accumulator holds 0C3H(11000011B) and register 0 holds 55H (01010101B) then the

instruction,

ANL A,R0

will leave 41H (01000001B) in the Accumulator.

When the destination is a directly addressed byte, this instruction will clear combinations of

bits in any RAM location or hardware register. The mask byte determining the pattern of bits

to be cleared would either be a constant contained in the instruction or a value computed in

the Accumulator at run-time. The instruction,

ANL Pl, #01110011B

will clear bits 7, 3, and 2 of output port 1.

ANL A,Rn

Bytes:

Cycles:

Encoding:

0 1 0 1

1 r r r

Operation:

ANL

(A)←(A)

←(A)

(A)

(Rn)

ANL A,direct

Bytes:

Cycles:

Encoding:

0 1 0 1

direct address

Operation:

ANL

(A)←(A)

←(A)

(A)

(direct)

ANL A,@Ri

Bytes:

Cycles:

Encoding:

0 1 0 1

0 1 1 i

Operation:

ANL

(A)←(A)

←(A)

(A)

((Ri))

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