89c51usb仿真器原理图，超级棒，拿出来与大家分享-Schematic 89c51usb emulator, super rod, out to share with you

周立功公司的P89V51RD2的IAP升级实现的，完整文档，官网只能载到前三章。-Ligong P89V51RD2 week' s escalation of the realization of the IAP, complete documents, the official website only contains three chapters.

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