Programmable Serial Channel 8-bit Microcontroller
1 (RXD) (TXD) (INT0) (INT1) (T0) (T1) (AD4) (AD5) (AD6) (AD7)EA/ (A15) (A14) (A13)44434241403938373635341213141516171 819202122(WR) (RD) (A8) (A9) (A10) (A11) (A12) (T2 EX) (T2) (AD0) (AD1) (AD2) (AD3)Features Compatible with MCS-51 Products 4K Bytes of In-System Reprogrammable Flash Memory Endurance: 1,000 Write/Erase Cycles Fully Static Operation: 0 Hz to 24 MHz Three-level Program Memory Lock 128 x 8-bit Internal RAM 32 Programmable I/O Lines Two 16-bit Timer/Counters Six Interrupt Sources Programmable Serial Channel Low-power Idle and Power-down ModesDescriptionThe AT89C51 is a low-power, high-performance CMOS 8-bit microcomputer with 4Kbytes of Flash Programmable and erasable read only memory (PEROM).
effect if the microcontroller is in external execution mode. PSEN Program Store Enable is the read strobe to external pro-gram memory. When the AT89C51 is executing code from external pro-gram memory, PSEN is activated twice each machine cycle, except that two PSEN activations are skipped during each access to external data memory. EA/VPP
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