Electronic Components Datasheet Search
  English  ▼

Delete All


Preview PDF Download HTML

P87LPC764 Datasheet(PDF) 20 Page - NXP Semiconductors

Part No. P87LPC764
Description  Low power, low price, low pin count (20 pin) microcontroller with 4 kbyte OTP
Download  60 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

P87LPC764 Datasheet(HTML) 20 Page - NXP Semiconductors

Back Button P87LPC764 Datasheet HTML 16Page - NXP Semiconductors P87LPC764 Datasheet HTML 17Page - NXP Semiconductors P87LPC764 Datasheet HTML 18Page - NXP Semiconductors P87LPC764 Datasheet HTML 19Page - NXP Semiconductors P87LPC764 Datasheet HTML 20Page - NXP Semiconductors P87LPC764 Datasheet HTML 21Page - NXP Semiconductors P87LPC764 Datasheet HTML 22Page - NXP Semiconductors P87LPC764 Datasheet HTML 23Page - NXP Semiconductors P87LPC764 Datasheet HTML 24Page - NXP Semiconductors Next Button
Zoom Inzoom in Zoom Outzoom out
 20 / 60 page
background image
Philips Semiconductors
Product data
Low power, low price, low pin count (20 pin)
microcontroller with 4 kbyte OTP
2003 Sep 03
Open Drain Output
The open drain output configuration turns off all pull-ups and only
drives the pull-down transistor of the port driver when the port latch
contains a logic 0. To be used as a logic output, a port configured in
this manner must have an external pull-up, typically a resistor tied to
VDD. The pull-down for this mode is the same as for the
quasi-bidirectional mode.
The open drain port configuration is shown in Figure 11.
Push-Pull Output
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.
The push-pull port configuration is shown in Figure 12.
The three port pins that cannot be configured are P1.2, P1.3, and
P1.5. The port pins P1.2 and P1.3 are permanently configured as
open drain outputs. They may be used as inputs by writing ones to
their respective port latches. P1.5 may be used as a Schmitt trigger
input if the P87LPC764 has been configured for an internal reset
and is not using the external reset input function RST.
Additionally, port pins P2.0 and P2.1 are disabled for both input and
output if one of the crystal oscillator options is chosen. Those
options are described in the Oscillator section.
The value of port pins at reset is determined by the PRHI bit in the
UCFG1 register. Ports may be configured to reset high or low as
needed for the application. When port pins are driven high at reset,
they are in quasi-bidirectional mode and therefore do not source
large amounts of current.
Every output on the P87LPC764 may potentially be used as a 20
mA sink LED drive output. However, there is a maximum total output
current for all ports which must not be exceeded.
All ports pins of the P87LPC764 have slew rate controlled outputs.
This is to limit noise generated by quickly switching output signals.
The slew rate is factory set to approximately 10 ns rise and fall times.
The bits in the P2M1 register that are not used to control
configuration of P2.1 and P2.0 are used for other purposes. These
bits can enable Schmitt trigger inputs on each I/O port, enable
toggle outputs from Timer 0 and Timer 1, and enable a clock output
if either the internal RC oscillator or external clock input is being
used. The last two functions are described in the Timer/Counters
and Oscillator sections respectively. The enable bits for all of these
functions are shown in Figure 13.
Each I/O port of the P87LPC764 may be selected to use TTL level
inputs or Schmitt inputs with hysteresis. A single configuration bit
determines this selection for the entire port. Port pins P1.2, P1.3,
and P1.5 always have a Schmitt trigger input.
Figure 11. Open Drain Output
Figure 12. Push-Pull Output

Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54  55  56  57  58  59  60 

Datasheet Download

Go To PDF Page

Link URL

Privacy Policy
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com

Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn