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P89LPC902FN Datasheet(PDF) 10 Page - NXP Semiconductors

Part # P89LPC902FN
Description  8-bit microcontrollers with two-clock 80C51 core 1 kB 3 V Flash with 128-byte RAM
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

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Philips Semiconductors
P89LPC901/902/903
8-bit microcontrollers with two-clock 80C51 core
Product data
Rev. 04 — 21 November 2003
10 of 55
9397 750 12293
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
Table 4:
P89LPC902 pin description
Symbol
Pin
Type
Description
P0.0 - P0.6
2, 3, 5, 6,
7
I/O
Port 0: Port 0 is an I/O port with a user-configurable output type. During reset Port 0
latches are configured in the input only mode with the internal pull-up disabled. The
operation of Port 0 pins as inputs and outputs depends upon the port configuration
selected. Each port pin is configured independently. Refer to Section 8.12.1 “Port
configurations” and Table 13 “DC electrical characteristics” for details.
The Keypad Interrupt feature operates with Port 0 pins.
All pins have Schmitt triggered inputs.
Port 0 also provides various special functions as described below:
3
I/O
P0.0 — Port 0 bit 0.
I
CMP2 — Comparator 2 output.
I
KBI0 — Keyboard input 0.
2
I/O
P0.2 — Port 0 bit 2.
I
CIN2A — Comparator 2 positive input.
I
KBI2 — Keyboard input 2.
7
I/O
P0.4 — Port 0 bit 4.
I
CIN1A — Comparator 1 positive input.
I
KBI4 — Keyboard input 4.
6
I/O
P0.5 — Port 0 bit 5.
I
CMPREF — Comparator reference (negative) input.
I
KBI5 — Keyboard input 5.
5
I/O
P0.6 — Port 0 bit 6.
O
CMP1 — Comparator 1 output.
I
KBI6 — Keyboard input 6.
P1.0 - P1.5
4
Port 1: Port 1 is an I/O port with a user-configurable output type. During reset Port 1
latches are configured in the input only mode with the internal pull-up disabled. The
operation of the configurable Port 1 pins as inputs and outputs depends upon the
port configuration selected. Each of the configurable port pins are programmed
independently. Refer to Section 8.12.1 “Port configurations” and Table 13 “DC
electrical characteristics” for details. P1.5 is input only.
All pins have Schmitt triggered inputs.
Port 1 also provides various special functions as described below:
4I
P1.5 — Port 1 bit 5 (input only).
I
RST — External Reset input during Power-on or if selected via UCFG1. When
functioning as a reset input a LOW on this pin resets the microcontroller, causing I/O
ports and peripherals to take on their default states, and the processor begins
execution at address 0. Also used during a power-on sequence to force In-System
Programming mode.
VSS
8I
Ground: 0 V reference.
VDD
1I
Power Supply: This is the power supply voltage for normal operation as well as Idle
and Power-down modes.


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