Description: 可编程间隔定时器（Programmable Interval Timer，PIT， 8253或8254模型），也叫做系统时钟，是一个非常有用的芯片，可以在一定时间间隔精确地产生中断。芯片本身有3个通道：通道0绑定到IRQ0，在可预知和规则的时间中断CPU；通道1特定于系统；通道2则连接到系统扬声器。就像你看到的一样，单个的芯片为系统提供了几个非常重要的服务。-Programmable Interval Timer (Programmable Interval Timer, PIT, 8253 or 8254 model), also known as the system clock, is a very useful chip in a certain time interval can be accurately generate an interrupt. Chip itself has three channels: channel 0 bound to IRQ0, and rules in the foreseeable time interrupt CPU channel 1-specific systems 2-channel speaker connected to the system. As you see, like a single chip for the system provides several important services. Platform: |
Size: 4096 |
Author:注册和开 |
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Description: 实现5253和8255制作电子琴 文件中有详细的设计方案和工作流图 对大家有一定的帮助-8254
PROGRAMMABLE INTERVAL TIMER
Y Compatible with All Intel and Most
Other Microprocessors
Y Handles Inputs from DC to 10 MHz
Ð 8 MHz 8254
Ð 10 MHz 8254-2
Y Status Read-Back Command
Y Six Programmable Counter Modes
Y Three Independent 16-Bit Counters
Y Binary or BCD Counting
Y Single a5V Supply
Y Available in EXPRESS
Ð Standard Temperature Range Platform: |
Size: 61440 |
Author:杨洋 |
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Description: /看门狗定时器（WDT）是在每一个硬件定时器复位这使
/ /将一个可编程的后超时间隔。当WDT超时，它
/ /将强制器件复位。为了防止复位，WDT必须重新启动
/ /由应用软件之前，溢出。如果系统遇到
/ /软件或硬件故障无法重启软件
-// The Watchdog Timer (WDT) is a hardware timer enabled on every reset that
// will timeout after a programmable interval. When the WDT times out, it
// will force a device reset. To prevent the reset, the WDT must be restarted
// by application software before it overflows. If the system experiences a
// software or hardware malfunction preventing the software from restarting Platform: |
Size: 3072 |
Author:赵盈盈 |
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Description: 82c54 介绍
82C54是专为Intel系列微处理机而设计的一种可编程时间间隔定时器/计数器，它是一种通用芯片，在系统软件中可以把多级定时元素当成输入/输出端口中的一个阵列看待。-82c54 82C54 is designed for Intel introduced the microprocessor family designed a programmable interval timer/counter, it is a universal chip, in the system software elements can be multi-stage time as the input/output ports in a Array view. Platform: |
Size: 394240 |
Author:徐金月 |
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Description: 28 LED Clock Timer Circuit Schema With 74HCT
This is a programmable clock timer circuit that uses individual LEDs to indicate hours and minutes. 12 LEDs can be arranged in a circle to represent the 12 hours of a clock face and an additional 12 LEDs can be arranged in an outer circle to indicate 5 minute intervals within the hour. 4 additional LEDs are used to indicate 1 to 4 minutes of time within each 5 minute interval.
The circuit is powered from a small 12.6 volt center tapped line transformer and the 60 cycle line frequency is used for the time base. The transformer is connected in a full wave, center tapped configuration which produces about 8.5 volts unregulated DC. A 47 ohm resistor and 5.1 volt, 1 watt zener regulate the supply for the 74HCT circuits. Platform: |
Size: 8192 |
Author:AliOsX |
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