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8XL51FA Datasheet(PDF) 4 Page - Intel Corporation

No. de pieza 8XL51FA
Descripción Electrónicos  LOW VOLTAGE CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS
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Fabricante Electrónico  INTEL [Intel Corporation]
Página de inicio  http://www.intel.com
Logo INTEL - Intel Corporation

8XL51FA Datasheet(HTML) 4 Page - Intel Corporation

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8XL51FAFBFC
PIN DESCRIPTIONS
VCC Supply voltage
VSS Circuit ground
Port 0 Port 0 is an 8-bit open drain bidirectional IO
port As an output port each pin can sink several
inputs Port 0 pins that have 1’s written to them float
and in that state can be used as high-impedance
inputs
Port 0 is also the multiplexed low-order address and
data bus during accesses to external Program and
Data Memory In this application it uses strong inter-
nal pullups when emitting 1’s and can source and
sink several inputs
Port 0 also receives the code bytes during OTP
ROM programming and outputs the code bytes dur-
ing program verification External pullup resistors are
required during program verification
Port 1 Port 1 is an 8-bit bidirectional IO port with
internal pullups The Port 1 output buffers can drive
several inputs Port 1 pins that have 1’s written to
them are pulled high by the internal pullups and in
that state can be used as inputs As inputs Port 1
pins that are externally pulled low will source current
(IIL on the data sheet) because of the internal pull-
ups
In addition Port 1 serves the functions of the follow-
ing special features of the 8XL51FX
Port Pin
Alternate Function
P10
T2 (External Count Input to Timer
Counter 2) Clock Out
P11
T2EX (TimerCounter 2 Capture
Reload Trigger and Direction Control)
P12
ECI (External Count Input to the PCA)
P13
CEX0 (External IO for Compare
Capture Module 0)
P14
CEX1 (External IO for Compare
Capture Module 1)
P15
CEX2 (External IO for Compare
Capture Module 2)
P16
CEX3 (External IO for Compare
Capture Module 3)
P17
CEX4 (External IO for Compare
Capture Module 4)
Port 1 receives the low-order address bytes during
OTP ROM programming and verifying
Port 2 Port 2 is an 8-bit bidirectional IO port with
internal pullups The Port 2 output buffers can drive
several inputs Port 2 pins that have 1’s written to
them are pulled high by the internal pullups and in
that state can be used as inputs As inputs Port 2
pins that are externally pulled low will source current
(IIL on the data sheet) because of the internal pull-
ups
Port 2 emits the high-order address byte during
fetches from external Program Memory and during
accesses to external Data Memory that use 16-bit
addresses (MOVX
DPTR) In this application it
uses strong internal pullups when emitting 1’s Dur-
ing accesses to external Data Memory that use 8-bit
addresses (MOVX
Ri) Port 2 emits the contents of
the P2 Special Function Register
Some Port 2 pins receive the high-order address bits
during OTP ROM programming and program verifi-
cation
Port 3 Port 3 is an 8-bit bidirectional IO port with
internal pullups The Port 3 output buffers can drive
several inputs Port 3 pins that have 1’s written to
them are pulled high by the internal pullups and in
that state can be used as inputs As inputs Port 3
pins that are externally pulled low will source current
(IIL on the data sheet) because of the pullups
Port 3 also serves the functions of various special
features of the MCS 51 microcontroller family as
listed below
Port Pin
Alternate Function
P30
RXD (serial input port)
P31
TXD (serial output port)
P32
INT0 (external interrupt 0)
P33
INT1 (external interrupt 1)
P34
T0 (Timer 0 external input)
P35
T1 (Timer 1 external input)
P36
WR (external data memory write strobe)
P37
RD (external data memory read strobe)
RST Reset input A high on this pin for two machine
cycles while the oscillator is running resets the de-
vice The port pins will be driven to their reset condi-
tion when a minimum VIH2 voltage is applied wheth-
er the oscillator is running or not An internal pull-
down resistor permits a power-on reset with only a
capacitor connected to VCC
4


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