參數(shù)資料
型號(hào)： P89LPC903
廠商： NXP Semiconductors N.V.
英文描述： 8-bit microcontrollers with two-clock 80C51 core 1 kB 3 V Flash with 128-byte RAM
中文描述： 8位微控制器兩個(gè)小時(shí)80C51的核心具有1KB 3伏閃光的128字節(jié)RAM
文件頁(yè)數(shù)： 31/55頁(yè)
文件大?。?/td> 1236K
代理商： P89LPC903
Philips Semiconductors
P89LPC901/902/903
8-bit microcontrollers with two-clock 80C51 core
Product data
Rev. 04 — 21 November 2003
31 of 55
9397 750 12293
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
8.12.2
Quasi-bidirectional output configuration
Quasi-bidirectional output type can be used as both an input and output without the
need to reconfigure the port. This is possible because when the port outputs a logic
HIGH, it is weakly driven, allowing an external device to pull the pin LOW. When the
pin is driven LOW, it is driven strongly and able to sink a fairly large current. These
features are somewhat similar to an open-drain output except that there are three
pull-up transistors in the quasi-bidirectional output that serve different purposes.
The P89LPC901/902/903 is a 3 V device, however, the pins are 5 V-tolerant (except
for XTAL1 and XTAL2). In quasi-bidirectional mode, if a user applies 5 V on the pin,
there will be a current flowing from the pin to V
DD
, causing extra power consumption.
Therefore, applying 5 V in quasi-bidirectional mode is discouraged.
A quasi-bidirectional port pin has a Schmitt-triggered input that also has a glitch
suppression circuit.
8.12.3
Open-drain output configuration
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 V
DD
.
An open-drain port pin has a Schmitt-triggered input that also has a glitch
suppression circuit.
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 P89LPC901/902/903 incorporates an Analog Comparator. 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 as described in
Section 8.12.4 “Input-only configuration”
.
Digital inputs on Port 0 may be disabled through the use of the PT0AD register. On
any reset, the PT0AD bits default to ‘0’s to enable digital functions.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
P89LPC903FD 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontrollers with two-clock 80C51 core 1 kB 3 V Flash with 128-byte RAM
P89LPC903FD,112 功能描述:8位微控制器 -MCU 80C51 1K FL 128B RAM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
P89LPC903FD112 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU 80C51 12MHZ SOIC-8
P89LPC904 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontrollers with two-clock accelerated 80C51 core 1 kB 3 V byte-erasable Flash with 8-bit A/D converter
P89LPC904FD 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontrollers with two-clock accelerated 80C51 core 1 kB 3 V byte-erasable Flash with 8-bit A/D converter
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