W78ERD2芯片解密

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　　W78ERD2  Features：
　　. 8-bit CMOS microcontroller
　　. Pin compatible with standard 80C52
　　. Instruction-set compatible with MCS-51
　　. Four 8-bit I/O Ports
　　. One extra 4-bit I/O port, interrupt, chip select function
　　. Three 16-bit Timers
　　. Programmable clock out
　　. Programmable Counter Array (PCA): PWM, Capture, Compare, Watchdog
　　. 9 interrupt sources with 4 levels of priority
　　. One enhanced full duplex serial port with framing error detection and automatic address
　　recognition
　　. 64KB In-system Programmable Flash EPROM (AP Flash EPRAOM)
　　. 4KB Auxiliary Flash EPROM for loader program (LD Flash EPROM)
　　. 256+1K bytes of on-chip RAM. (Including 1K bytes of AUX-RAM, software selectable)
　　. Software Reset
　　. 12 clocks per machine cycle operation (default). Speed up to 40 MHz.
　　. 6 clocks per machine cycle operation which is set by the writer. Speed up to 20 MHz.
　　. 2 DPTR registers
　　. Low EMI (inhibit ALE)
　　. Built-in power management with idle mode and power down mode
　　. Code protection
　　. Packages:
　　. DIP 40: W78ERD2A40DN
　　. PLCC 44: W78ERD2A40PN
　　. QFP 44: W78ERD2A40FN