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INSTRUCTION SET
MOVO A,Pp Move Port 4-7 Data
to
Accumulator
10000111ppi
This
is
a 2-cycle instruction. Data on 8243 port
'p' is moved (read)
to
accumulator bits 0-3.
Accumulator
bits 4-7 are zeroed.
(0-3)
..... (Pp) p=4-7
(4-7) ..... 0
Note: Bits
0-1
of
the opcode are used to represent ports
4-7.
If
you are coding in binary rather than assembly
language,
the mapping is
as
follows:
Bits 1 0 Port
00
4
015
106
1 1 7
Example: INPPT5: MOVD A,P5 ;MOVE PORT 5 DATA TO ACC
;BITS 0-3, ZERO
ACe
BITS 4-7
MOVO Pp,A Move Accumulator Data
to
Port 4-7
10011111ppl
This
is a 2-cycle instruction. Data in
accumulator
bits
0-3
is moved (written)
to
8243 port 'p'.
Accumulator
bits
4-7
are unaffected. (See NOTE
above regarding
port
mapping.)
(Pp)
...
(A
o
-
3
)
p=4-7
Example: Move data in accumulator to ports 4 and
5.
OUTP45: MOVD P4,A ;MOVE ACC BITS 0-3 TO PORT 4
SWAP A ;EXCHANGE ACC BITS 0-3 AND 4-7
MOVD P5,A ;MOVE ACC BITS 0-3 TO PORT 5
MOVP
A,@A
Move Current
Page
Data
to
Accumulator
11010100111
The contents
of
the program memory location addressed
by the
accumulator are moved
to
the accumulator. Only
bits 0-7
of
the program counter are' affected, limiting
the program memory reference
to
the current page. The
program counter
is
restored following this operation
(PC
O
-
7
) .....
(A)
(A) ..... ((PC»
Note: This is a 1-byte, 2-cycle instruction. If it appears
in
location 255
of
a program memory page,
@A
addresses
a
location in the following page.
Mnemonics copyright Intel Corporation
1976.
4·25