P89LPC9211FDH datasheet(33/75 Pages) NXP

33 / 75 page

P89LPC92X1

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Product data sheet

Rev. 2 — 1 December 2010

33 of 75

NXP Semiconductors

P89LPC9201/9211/922A1/9241/

8-bit microcontroller with 8-bit ADC

An open-drain port pin has a Schmitt trigger input that also has a glitch suppression

circuit.

7.16.1.3

Input-only configuration

The input-only port configuration has no output drivers. It is a Schmitt trigger input that

also has a glitch suppression circuit.

7.16.1.4

Push-pull output configuration

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 Table 11 “Limiting values”.

7.16.2 Port 0 analog functions

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.

7.16.3 Additional port features

After power-up, all pins are in Input-Only mode. Please note that this is different from

the LPC76x series of devices.

• 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.

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 Table 12 “Static characteristics” for detailed

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.

7.17 Power monitoring functions

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.

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