And - Intel MCS48 User Manual

8041 A/8741
A
PIN
DESCRIPTION
Signal Description
UPI
INSTRUCTION SET
Mnemonic Description
Bytes Cycles
D -D
7
Three-state, bidirectional
DATA BUS BUFFER
lines
used
to interface the
UPI-41A
to
an
8-bit
master
system
data
bus.
p
io
_p
i7
8 -
bit
>
PORT
1
quasi-bidirectional
I/O lines.
Pon~Po
WR
RD
CS
Ao
X^
X
2
SYNC
EA
PROG
RESET
SS
8-bit,
PORT
2 quasi-bidirectional
I/O lines.
The
lower
4
bits (P20-P23)
interface
directly to the
8243
I/O ex-
pander device and
contain
address and data
infor-
mation during
PORT
4-7 access.
The
upper
4 bits
(P24-P27)
can be
programmed
to provide Interrupt
Request and
DMA
Handshake
capability.
Software
control
can configure P
24
as
OBF
(Output Buffer
Full),
P
25
as
IBF
(Input Buffer
Full
),
P
26
a
s
DRQ
(DMA
Request), and
P
27
as
DACK
(DMA
ACKnowledge).
I/O
write input
which enables
the
master
CPU
to
write
data and
command
words
to the
UPI-41A
IN-
PUT DATA BUS BUFFER.
I/O
read input
which enables
the
master
CPU
to
read data
and
status
words from
the
OUTPUT DATA
BUS BUFFER
or status
register.
Chip
select input
used
to select
one
UPI-41A out
of
several
connected
to a
common
data bus.
Address
input
used
by the master processor
to in-
dicate
whether
byte transfer
is
data
or
command.
Input pins
which can be
directly tested using condi-
tional branch
instructions.
T, also functions as the event timer
input (under
software
control).
T
is
used
during
PROM
program-
ming and
verification
in
the
8741A.
Inputs for
a
crystal,
LC
or an external timing
signal
to
determine the
internal oscillator frequency.
Output
signal
which occurs once
per
UPI-41A
in-
struction cycle.
SYNC
can be used as
a
strobe
for
external
circuitry;
it
is
also used
to
synchronize
single step
operation.
External access
input
which
allows emulation,
testing
and
PROM/ROM
verification.
Multifunction
pin
used as
the
program
pulse input
during
PROM
programming.
During
I/O
expander access
the
PROG
pin acts as
an address/data
strobe to the 8243.
Input used
to reset
status
flip-flops
and
to set the
program
counter
to zero.
RESET
is
also
used during
PROM
programming and
verification.
Single step
input
used
in
the
8741A
in
conjunction
with the
SYNC
output
to step the
program
through
each
instruction.
+ 5V power
supply
pin.
+ 5V
during normal
operation.
Programming
supply
pin
during
PROM
programming.
Low
power
standby
pin
in
ROM
version.
Circuit
ground
potential.
ACCUMULATOR
ADD
A,Rr
Add
register to
A
ADD A,@Rr Add
data
memory
to
A
ADD
A.#data
Add immediate
to
A
2 2
ADDC
A,Rr
Add immed.
to
A
with carry
ADDC
A,@Rr Add immed.
to
A
with carry
ADDC
A.#data
Add immed.
to
A
with carry
2
2
ANL
A,Rr
AND
register to
A
ANL A,@Rr
AND
data
memory
to
A
ANL
A,#data
AND
immediate
to
A
2 2
ORL
A,Rr
OR
register to
A
ORL A.@Rr OR
data
memory
to
A
ORL
A.#data
OR immediate
to
A
2 2
XRL
A.Rr
Exclusive
OR
register to
A
XRL A.@Rr
Exclusive
OR
data
memory
to
A
XRL A,#data Exclusive
OR
immediate
to
A
2 2
INC
A Increment
A
DEC A Decrement
A
CLR A
Clear
A
CPL A
Complement A
DA A
Decimal Adjust
A
SWAP
A
Swap
digits of
A
RLA
Rotate
A
left
RLCA
Rotate
A
left
through
carry
RR A
Rotate
A
right
RRC
A
Rotate
A
right
through
carry
INPUT/OUTPUT
IN
A,Pp
Input port
to
A
1
2
OUTL
Pp.A Output
A
to
port
1
2
ANL
Pp.#data
AND
immediate
to
port
2 2
ORL Ppidata OR
immediate
to
port
2 2
IN
A.DBB
Input
DB8
to A, clear IBF
1 1
OUT
DBB.A
Output
A
to
DBB,
set
OBF
1 1
MOVD
A,Pp
Input
Expander
port
to
A
1
2
MOVD
Pp.A Output
A
to
Expander
port
1
2
ANLD
Pp.A
AND
A
to
Expander
port
1
2
ORLD
Pp.A
OR A
to
Expander
port
1
2
DATA
MOVES
MOV
A,Rr
Move
register
to
A
1 1
MOV
A,@Rr Move
data
memory
to
A
1 1
MOV
A.#data
Move
immediate
to
A
2 2
MOV
Rr.A
Move A
to register
1 1
MOV
@Rr.A Move A
to
data
memory
1
1
MOV
Rr.#data
Move
immediate
to register
2 2
MOV
@Rr,#data
Move
immediate
to
data
memory
2 2
MOV A.PSW
Move
PSW
to
A
1 1
MOV
PSW.A
Move A
to
PSW
1 1
XCH
A,Rr
Exchange A and
register
1 1
XCH
A,@Rr Exchange A and
data
memory
1 1
XCHD A,@Rr
Exchange
digit of
A
and
register
1
1
MOVP
A,@A Move
to
A
from
current page
1
2
M0VP3, A,@A Move
to
A
from page
3
1
2
TIMER/COUNTER
MOV
A.T
Read Timer
/Counter
MOV
T,A Load Timer/Counter
STRTT
Start
Timer
STRT CNT
Start
Counter
STOP TCNT
Stop Timer/Counter
EN
TCNTI
Enable Timer/Counter
Interrupt
OIS TCNTI
Disable Timer/Counter
Interrupt
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A