P89LPC913 PHILIPS [NXP Semiconductors], P89LPC913 Datasheet - Page 8

• Manufacturer Part Number: P89LPC913
• Description: 8-bit microcontrollers with two-clock 80C51 core 1 kB 3 V Flash with 128-byte RAM
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
Table 3:
9397 750 14468
Product data
Symbol
P0.2, P0.4 to
P0.6
P1.2, P1.5
P89LPC912 pin description
12
11
5
6
3
Pin
13
6.2 Pin description
Type
I/O
I/O
I
I
I/O
I
I
I/O
I
I
I/O
O
I
I/O
(P1.2);
I (P1.5)
I/O
I/O
I
I
Description
Port 0: Port 0 is a 4-bit 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
9.11.1 “Port configurations”
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:
P0.2 — Port 0 bit 2.
CIN2A — Comparator 2 positive input A.
KBI2 — Keyboard input 2.
P0.4 — Port 0 bit 4.
CIN1A — Comparator 1 positive input A.
KBI4 — Keyboard input 4.
P0.5 — Port 0 bit 5.
CMPREF — Comparator reference (negative) input.
KBI5 — Keyboard input 5.
P0.6 — Port 0 bit 6.
CMP1 — Comparator 1 output.
KBI6 — Keyboard input 6.
Port 1: Port 1 is a 2-bit I/O port with P1.2 having a user-configurable output type as
noted below. During reset Port 1 latches are configured in the input only mode with
the internal pull-up disabled. The operation of the P1.2 input and outputs depends
upon the port configuration selected. Refer to
Table 13 “DC electrical characteristics”
an output. P1.5 is input only.
All pins have Schmitt triggered inputs.
Port 1 also provides various special functions as described below:
P1.2 — Port 1 bit 2. (Open drain when used as an output.)
T0 — Timer/counter 0 external count input or overflow output. (Open drain when used
as outputs.).
P1.5 — Port 1 bit 5. (Input only.)
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. When using an oscillator frequency above 12 MHz, the reset
input function of P1.5 must be enabled. An external circuit is required to hold
the device in reset at power-up until V
system power is removed V
voltage. When using an oscillator frequency above 12 MHz, in some
applications, an external brownout detect circuit may be required to hold the
device in reset when V
Rev. 03 — 17 December 2004
DD
falls below the minimum specified operating voltage.
and
8-bit microcontrollers with two-clock 80C51 core
DD
Table 13 “DC electrical characteristics”
will fall below the minimum specified operating
for details. P1.2 is an open drain when used as
P89LPC912/913/914
DD
has reached its specified level. When
Section 9.11.1 “Port configurations”
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
for details.
Section
8 of 63
and