P89LPC932BA datasheet(23/60 Pages) PHILIPS

23 / 60 page

Philips Semiconductors

P89LPC932

8-bit microcontroller with accelerated two-clock 80C51 core

Product data

Rev. 04 — 06 January 2004

23 of 60

9397 750 12379

8.12.4

Input-only conﬁguration

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

that also has a glitch suppression circuit.

8.12.5

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.

8.12.6

Port 0 analog functions

The P89LPC932 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 ‘0’s to enable digital functions.

8.12.7

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 and are conﬁgurable for either input-only

or open-drain.

Every output on the P89LPC932 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 8 “DC electrical 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.

8.13 Power monitoring functions

The P89LPC932 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.

8.13.1

Brownout detection

The Brownout detect function determines if the power supply voltage drops below a

certain level. The default operation is for a Brownout detection to cause a processor

reset, however it may alternatively be conﬁgured to generate an interrupt.

Brownout detection may be enabled or disabled in software.

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