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按键扫描 51单片机加8279
8279通过74LS 138译码器扩展4×4键盘、6位显示器。
由3...
按键扫描 51单片机加8279
8279通过74LS 138译码器扩展4×4键盘、6位显示器。
由3-8译码器对SL0~SL2译出键扫描线,由另一3-8译码器译出显示器的位扫描线,并采用了编码扫描方式。
为了防止出现重键现象,扫描输出线高位SL3不参加键扫描译码。CPU对8279的监视采用了查询方式,故8279的中断请求信号IRQ悬空未用。
-Scan button 82,798,279 plus 51 single-chip decoder 74LS 138 through the expansion of 4 × 4 keyboard, the display 6. From 3-8 decoder SL0 ~ SL2 translated to the key scanning line, by another 3-8 decoder translated display scan line, and uses code scanning. In order to prevent the emergence of the phenomenon of re-key, scan the output line does not take part in high level SL3 scan decoding keys. CPU on the 8279 surveillance using the query mode, the 8279 interrupt request signal IRQ left unused.
- 2022-03-09 10:15:53下载
- 积分:1
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EMC的开发库 是单片机性价比高的选择 提高快速开发
EMC的开发库 是单片机性价比高的选择 提高快速开发-EMC microcontroller development libraries are cost-effective option to enhance rapid development of high
- 2022-03-02 16:02:31下载
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基于avr单片机的,spi接口的sd卡读写源程序
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flashflex51单片机
FlashFlex51微控制器
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CC2430 10 experiments based on the experimental temperature
CC2430 基础实验十 片内温度的实验-CC2430 10 experiments based on the experimental temperature
- 2023-05-19 03:10:03下载
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NRF905 C51 chip receiver subroutine
NRF905芯片的C51接收子程序-NRF905 C51 chip receiver subroutine
- 2023-02-09 09:35:03下载
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max7219控制的源程序,经过测试,给需要者
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- 2022-09-14 10:40:04下载
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ATmega8 + LM358
ATMEGA8+LM358-125KHzRFID读卡器程序。功能稳定性。11.0592MHz。不带74X4060。
- 2022-01-28 04:13:52下载
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信号处理单片机及应用
信号处理单片机及应用-signal processing and microcontroller applications
- 2023-06-17 16:30:08下载
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CAN总线与51单片机的接口原理图,使用的是sja1000和tja1040(philips).还包括了具体的文档资料和c语言控制代码(附加了LCD代码和LCD接...
CAN总线与51单片机的接口原理图,使用的是sja1000和tja1040(philips).还包括了具体的文档资料和c语言控制代码(附加了LCD代码和LCD接口以及电源变换原理图).搞CAN总线一步到位.-CAN Bus and 51 microcontroller interface schematics, using the sja1000 and tja1040 (Philips). Also include the specific information and documentation control code language c (Additional code of LCD and LCD interfaces, and power transformation diagram). CAN engage in one go.
- 2022-02-21 23:09:31下载
- 积分:1