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在做项目（工程）的时候，我们经常要用到比较多的按键，而且IO 资源紧张，
于是我们就想方设法地在别的模块中节省IO 口，好不容易挤出一两个IO 口，却...
在做项目（工程）的时候，我们经常要用到比较多的按键，而且IO 资源紧张，
于是我们就想方设法地在别的模块中节省IO 口，好不容易挤出一两个IO 口，却
发现仍然不够用，实在没办法了就添加一个IC 来扫键。一个IC 虽然价格不高，
但对于大批量生产而且产品利润低的厂家来说，这是一笔不菲的开支!
那，我们能不能想到比较好的扫键方法：用最少的IO 口，扫最多的键？可以吗？-Doing the project (engineering), we often use the relatively large number of keys, and the IO resource constraints, so we are trying to save in another module IO ports, finally out of one or two IO ports, only to find is still not enough there is really no other way to add an IC to sweep on the keys. Although the price of an IC is not high, but low profits, high-volume production and product manufacturers, this is spending a lot of money! That, we can not think of a better scan key method: with a minimum of IO ports, scan Most of the keys? OK?
- 2022-08-10 23:32:47下载
- 积分：1
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sd卡(驱动)工作原理分析，对驱动SB卡有很大帮助
sd卡(驱动)工作原理分析，对驱动SB卡有很大帮助-sd card (driver) working principle analysis of SB card drivers are very helpful
- 2022-08-21 23:01:23下载
- 积分：1
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MCS
51单片机驱动can控制器sja1000的源程序-MCS-51 DRIVER CAN-BUS CONTROLLER SJA1000 SOURCE PROGRAM
- 2022-11-23 02:50:03下载
- 积分：1
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isd4003 voice playback and recording system procedures, the test was successful,...
isd4003语音系统的回放和录音程序,测试成功,请有这方面经验的朋友多多指教-isd4003 voice playback and recording system procedures, the test was successful, have experience in this area exhibitions Friend
- 2022-04-29 08:14:33下载
- 积分：1
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数字电压表是ＳＴＣ单片机控制，四挡开关，０－１００Ｖ电压...
数字电压表是ＳＴＣ单片机控制，四挡开关，０－１００Ｖ电压-Digital voltage meter is a single-chip control of STC,四挡switch ,0-100V voltage
- 2022-03-01 11:30:06下载
- 积分：1
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使用PWM6输出PWM信号，通过滤波电路实现DAC转换。
使用PWM6输出PWM信号，通过滤波电路实现DAC转换。-The use of the output PWM signal PWM6 through the filter circuit DAC conversion implementation.
- 2022-02-06 06:52:52下载
- 积分：1
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时钟芯片DS1302的设置、读取和测试程序
时钟芯片DS1302的设置、读取和测试程序-DS1302 clock chip settings, read and test procedures
- 2022-01-25 15:48:08下载
- 积分：1
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这是一个用汇编语言编写的程序,用来控制电阻加热炉温度
这是一个用汇编语言编写的程序,用来控制电阻加热炉温度-This is a compiled language with the procedures used to control the temperature resistance furnace
- 2022-03-11 02:00:35下载
- 积分：1
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I2C的源代码,经本人测试通过,完全没有任何错误
I2C的源代码,经本人测试通过,完全没有任何错误-I2C source code, as I tested, there is no any error
- 2023-08-29 14:15:03下载
- 积分：1
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深圳市拓普微科技开发有限公司TCB8000A彩色LCD控制板应用参考。...
深圳市拓普微科技开发有限公司TCB8000A彩色LCD控制板应用参考。-Shenzhen Micro Technology Co., Ltd. Tuopu TCB8000A reference color LCD control panel applications.
- 2022-04-18 11:57:01下载
- 积分：1
