AT89C51

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 Modes Description The AT89C51 is a low-power, high-performance CMOS 8-bit microcomputer with 4K bytes of Flash programmable and erasable read only memory (PEROM). The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard MCS-51 instruction set and pinout. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C51 is a powerful microcomputer which provides a highly-flexible and cost-effective solution to many embedded control applications. (WR)P3.6 12 (RD) P3.7 13 XTAL2 14 XTAL1 15 GND 16 GND 17 (A8) P2.0 18 (A9) P2.1 19 (A10) P2.2 20 (A11) P2.3 21 (A12) P2.4 22 44 43 42 41 40 39 38 37 36 35 34 P1.4 P1.3 P1.2 P1.1 (T2 EX) P1.0 (T2) NC VCC P0.0 (AD0) P0.1 (AD1) P0.2 (AD2) P0.3 (AD3) Pin Configurations PQFP/TQFP P1.5 P1.6 P1.7 RST (RXD) P3.0 NC (TXD) P3.1 (INT0) P3.2 (INT1) P3.3 (T0) P3.4 (T1) P3.5 1 2 3 4 5 6 7 8 9 10 11 33 PO.4 (AD4) 32 P0.5 (AD5) 31 P0.6 (AD6) 30 P0.7 (AD7) 29 ...