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8XL52 Datasheet(PDF) 4 Page - Intel Corporation

No. de Pieza. 8XL52
Descripción  LOW VOLTAGE CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS
Descarga  20 Pages
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Fabricante  INTEL [Intel Corporation]
Página de inicio  http://www.intel.com
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8XL52 Datasheet(HTML) 4 Page - Intel Corporation

 
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8XL525458
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 8XL5X
Port Pin
Alternate Function
P10
T2 (External Count
Input to Timer
Counter 2) Clock
Out
P11
T2EX (Timer
Counter 2 Capture
Reload Trigger and
Direction Control)
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 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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