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參數(shù)資料
| 型號： | P89LPC938FDH |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-bit microcontroller with accelerated two-clock 80C51 core 8 kB 3 V byte-erasable Flash with 10-bit A-D converter |
| 封裝： | P89LPC938FDH<SOT361-1 (TSSOP28)|<<http://www.nxp.com/packages/SOT361-1.html<1<Always Pb-free,;P89LPC938FHN<SOT788-1 (HVQFN28)|<<http://www.nxp.com/packages/SOT788-1.html& |
| 文件頁數(shù)： | 17/68頁 |
| 文件大?。?/td> | 318K |
| 代理商： | P89LPC938FDH |
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9397 750 14051
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 01 — 25 February 2005
24 of 68
Philips Semiconductors
P89LPC938
8-bit microcontroller with 10-bit A/D converter
7.13 I/O ports
The P89LPC938 has four I/O ports: Port 0, Port 1, Port 2, and Port 3. Ports 0, 1and 2 are
8-bit ports, and Port 3 is a 2-bit port. The exact number of I/O pins available depends upon
the clock and reset options chosen, as shown in Table 7.
[1]
Required for operation above 12 MHz.
7.13.1 Port congurations
All but three I/O port pins on the P89LPC938 may be congured by software to one of four
types on a bit-by-bit basis. These are: quasi-bidirectional (standard 80C51 port outputs),
push-pull, open drain, and input-only. Two conguration registers for each port select the
output type for each port pin.
1. P1.5 (RST) can only be an input and cannot be congured.
2. P1.2 (SCL/T0) and P1.3 (SDA/INT0) may only be congured to be either input-only or
open-drain.
7.13.1.1
Quasi-bidirectional output conguration
Quasi-bidirectional output type can be used as both an input and output without the need
to recongure 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 P89LPC938 is a 3 V device, but the pins are 5 V-tolerant. In quasi-bidirectional mode,
if a user applies 5 V on the pin, there will be a current owing from the pin to VDD, 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.
7.13.1.2
Open-drain output conguration
The open-drain output conguration 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 congured in this manner must have an external pull-up, typically a resistor
tied to VDD.
Table 7:
Number of I/O pins available
Clock source
Reset option
Number of I/O pins
(28-pin package)
On-chip oscillator or watchdog oscillator
No external reset (except during power-up)
26
External RST pin supported
25
External clock input
No external reset (except during power-up)
25
External RST pin supported [1]
24
Low/medium/high speed oscillator
(external crystal or resonator)
No external reset (except during power-up)
24
External RST pin supported [1]
23
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相關代理商/技術參數(shù) |
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|---|---|
| P89LPC938FDH,529 | 功能描述:8位微控制器 -MCU 80C51 8K FL 768B 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 安裝風格:SMD/SMT |
| P89LPC938FDH529 | 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU 80C51 18MHZ TSSOP-28 |
| P89LPC938FHN | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontroller with accelerated two-clock 80C51 core 8 kB 3 V byte-erasable Flash with 10-bit A/D converter |
| P89LPC938FHN,151 | 功能描述:8位微控制器 -MCU 8K FL/768B RAM/512B 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 安裝風格:SMD/SMT |
| P89LPC938FHN-S | 功能描述:8位微控制器 -MCU 8K FL/768B RAM/512B EE/10B ADC 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 安裝風格:SMD/SMT |
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