P89LPC92X1 NXP Semiconductors, P89LPC92X1 Datasheet - Page 33

• Manufacturer Part Number: P89LPC92X1
• Description: The P89LPC9201/9211/922A1/9241/9251 is a single-chip microcontroller, available in lowcost packages, based on a high performance processor architecture that executesinstructions in two to four clocks, six times the rate of standard 80C51 devices
• Manufacturer: NXP Semiconductors

NXP Semiconductors
P89LPC92X1
Product data sheet
7.16.1.3 Input-only configuration
7.16.1.4 Push-pull output configuration
7.16.2 Port 0 analog functions
7.16.3 Additional port features
7.17 Power monitoring functions
An open-drain port pin has a Schmitt trigger input that also has a glitch suppression
circuit.
The input-only port configuration has no output drivers. It is a Schmitt trigger input that
also has a glitch suppression circuit.
The push-pull output configuration has the same pull-down structure as both the
open-drain and the quasi-bidirectional output modes, but provides a continuous strong
pull-up when the port latch contains a logic 1. The push-pull mode may be used when
more source current is needed from a port output. A push-pull port pin has a
Schmitt triggered input that also has a glitch suppression circuit. The
P89LPC9201/9211/922A1/9241/9251 device has high current source on eight pins in
push-pull mode. See
The P89LPC9201/9211/922A1/9241/9251 incorporates two Analog Comparators. In order
to give the best analog function performance and to minimize power consumption, pins
that are being used for analog functions must have the digital outputs and digital inputs
disabled.
Digital outputs are disabled by putting the port output into the Input-Only
(high-impedance) mode.
Digital inputs on Port 0 may be disabled through the use of the PT0AD register, bits 1:5.
On any reset, PT0AD[1:5] defaults to logic 0s to enable digital functions.
After power-up, all pins are in Input-Only mode. Please note that this is different from
the LPC76x series of devices.
Every output on the P89LPC9201/9211/922A1/9241/9251 has been designed to sink
typical LED drive current. However, there is a maximum total output current for all ports
which must not be exceeded. Please refer to
specifications.
All ports pins that can function as an output have slew rate controlled outputs to limit noise
generated by quickly switching output signals. The slew rate is factory-set to
approximately 10 ns rise and fall times.
The P89LPC9201/9211/922A1/9241/9251 incorporates power monitoring functions
designed to prevent incorrect operation during initial power-up and power loss or
reduction during operation. This is accomplished with two hardware functions: Power-on
detect and brownout detect.
•
•
After power-up, all I/O pins except P1.5, may be configured by software.
Pin P1.5 is input only. Pins P1.2 and P1.3 are configurable for either input-only or
open-drain.
All information provided in this document is subject to legal disclaimers.
Table 11 “Limiting
Rev. 2 — 1 December 2010
P89LPC9201/9211/922A1/9241/
values”.
Table 12 “Static characteristics”
8-bit microcontroller with 8-bit ADC
© NXP B.V. 2010. All rights reserved.
for detailed
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