文献翻译基于AT89C51的定时器Word格式.docx
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(PEROM).
device
manufactured
using
Atmels
high-density
nonvolatile
technology
compatible
the
industry-standard
MCS-51
instruction
set
pinout.
on-chip
allows
program
to
be
reprogrammed
in-system
or
by
conventional
programmer.
By
combining
versatile
CPU
on
monolithic
chip,
Atmel
powerful
which
provides
highly-flexible
cost-effective
solution
many
embedded
control
applications.
Function
characteristic:
following
standard
features:
Flash,
128
RAM,
32
I/O
lines,
two
16-bit
timer/counters,
five
vector
two-level
interrupt
architecture,
full
duplex
serial
port,
oscillator
clock
circuitry.
In
addition,
designed
static
logic
for
operation
down
zero
frequency
supports
software
selectable
power
saving
modes.
Idle
Mode
stops
while
allowing
port
system
continue
functioning.
Power-down
saves
RAM
contents
but
freezes
disabling
all
other
chip
functions
until
next
hardware
reset.
Pin
VCC:
Supply
voltage.
GND:
Ground.
Port
0:
0
an
open-drain
bi-directional
port.
As
output
each
pin
can
sink
eight
TTL
inputs.
When
1s
are
written
pins,
pins
used
as
highimpedance
inputs.Port
may
also
configured
multiplexed
loworder
address/data
bus
during
accesses
external
data
memory.
this
mode
P0
has
internal
pullups.Port
receives
code
programming,and
outputs
programverification.
External
pullups
required
1:
1
pullups.The
buffers
sink/source
four
inputs.When
they
pulled
high
inputs,Port
that
externally
being
low
will
source
current
(IIL)
because
low-order
address
programming
verification.
2:
2
8
by
current,
emits
high-order
byte
fetches
from
use
addresses.
application,
it
uses
strong
pullupswhen
emitting
1s.
During
addresses,
P2
Special
Register.Port
bits
some
signals
3:
3
serves
various
special
features
listed
below:
PortPin
AltrenateFunctions
P3.0
RXD(seralinputPort)
P3.1
TXD(seraloutputPort)
P3.2
INT0(externalinterrupt0)
P3.3
INT1(externalinterrupt1)
P3.4
T0(time0externalinput)
P3.5
T1(time1externalinput)
P3.6
WR(externaldatamemorywritestrobe)
P3.7
RD(externaldatamemoryreadstrobe)
verification.
RST:
Reset
input.
A
machine
cycles
running
resets
device.
ALE/PROG:
Address
Latch
Enable
pulse
latching
This
input
(PROG)
programming.In
normal
ALE
emitted
at
constant
rate
1/6
frequency,
timing
clocking
purposes.
Note,
however,
one
skipped
access
Data
Memory.
If
desired,
disabled
setting
bit
SFR
location
8EH.
With
set,
active
MOVX
MOVC
instruction.
Otherwise,
weakly
high.
Setting
ALE-disable
no
effect
if
mic