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1 Features •Compatible with MCS-51 ™ Products •8K 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 •256 x 8-bit Internal RAM •32 Programmable I/O Lines •Three 16-bit Timer/Counters •Eight Interrupt Sources •Programmable Serial Channel •Low-power Idle and Power-down Modes Description The AT89C52 is a low-power, high-performance CMOS 8-bit microcomputer with 8K 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 80C51 and 80C52 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 AT89C52 is a powerful microcomputer which provides a highly-flexible and cost-effective solution to many embedded control applications. 8-bit Microcontroller with 8K Bytes Flash AT 8 9 C 5 2 Not Recommended for New Designs. Use AT89S52. Rev. 0313H–02/00 Pin Configurations PQFP/TQFP 1 2 3 4 5 6 7 8 9 10 11 33 32 31 30 29 28 27 26 25 24 23 P1.5 P1.6 P1.7 RST (RXD) P3.0 NC (TXD) P3.1 (INT0) P3.2 (INT1) P3.3 (T0) P3.4 iT1) P3.5 P0.4 (AD4) P0.5 (AD5) P0.6 (AD6) P0.7 (AD7) EA/VPP NC ALE/PROG PSEN P2.7 (A15) P2.6 (A14) P2.5 (A13) 4443424140393837363534 1213141516171819202122 (WR) P3.6 (RD) P3.7 XTAL2XTAL1 GND NC (A8) P2.0(A9) P2.1 (A10) P2.2(A11) P2.3(A12) P2.4 P1.4P1.3P1.2P1.1 (T2 EX)P1.0 (T2)NCVCCP0.0 (AD0)P0.1 (AD1)P0.2 (AD2)P0.3 (AD3) PDIP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 (T2) P1.0 (T2 EX) P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 RST (RXD) P3.0 (TXD) P3.1 (INT0) P3.2 (INT1) P3.3 (T0) P3.4 (T1) P3.5 (WR) P3.6 (RD) P3.7 XTAL2 XTAL1 GND VCC P0.0 (AD0) P0.1 (AD1) P0.2 (AD2) P0.3 (AD3) P0.4 (AD4) P0.5 (AD5) P0.6 (AD6) P0.7 (AD7) EA/VPP ALE/PROG PSEN P2.7 (A15) P2.6 (A14) P2.5 (A13) P2.4 (A12) P2.3 (A11) P2.2 (A10) P2.1 (A9) P2.0 (A8) PLCC 7 8 9 10 11 12 13 14 15 16 17 39 38 37 36 35 34 33 32 31 30 29 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 P0.4 (AD4) P0.5 (AD5) P0.6 (AD6) P0.7 (AD7) EA/VPP NC ALE/PROG PSEN P2.7 (A15) P2.6 (A14) P2.5 (A13) 654321 4443424140 1819202122232425262728 (WR) P3.6 (RD) P3.7 XTAL 2 XTAL1 GND NC (A8) P2.0(A9) P2.1 (A10) P2.2(A11) P2.3(A12) P2.4 P1.4P1.3P1.2P1.1 (T2 EX)P1.0 (T2)NCVCCP0.0 (AD0)P0.1 (AD1)P0.2 (AD2)P0.3 (AD3)