Advertisement
XRL
<dest-byte>, <src-byte>
Function:
Logical Exclusive OR for byte variables
Description:
XRL performs the bitwise logical Exclusive OR operation between the indicated
variables, storing the results in the destination. 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
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 0C3 H (11000011B) and register 0 holds 0AA H
(10101010B) then the instruction
XRL
will leave the accumulator holding the value 69 H (01101001B).
When the destination is a directly addressed byte, this instruction can complement
combinations of bits in any RAM location or hardware register. The pattern of bits
to be complemented is then determined by a mask byte, either a constant contained
in the instruction or a variable computed in the accumulator at run-time. The
instruction
XRL
will complement bits 5, 4, and 0 of output port 1.
XRL
A,Rn
Operation:
XRL2
(A) ← (A)
Encoding:
0 1 1 0
Bytes:
1
Cycles:
1
Semiconductor Group
A,R0
P1,#00110001B
v
(Rn)
1 r r r
*
206
Instruction Set
Advertisement
