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颈虏肠 can bus cntfet pinfet finfet mesfet diode vi characteristics semiconductor pn diode keyboard lcd peripherals quality assurance techniques crc cards designing process rtos threads process embedded and real time systems microcontroller pic computing arm assembly language programming arm development tool programmers model arm architecture compilation techniques components for embedded programs models of programs cpu bus ice rtc watchdog timer dma block diagram of embedded systems rc5 algorithm blowfish tripple des aes design tunnel diode varactor diode ldr laser diode zener diode embedded