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4-45 Features • Compatible with MCS-51™ Products • 4K Bytes of Reprogrammable Flash Memory – Endurance: 1,000 Write/Erase Cycles • 2.7V to 6V Operating Range • Fully Static Operation: 0 Hz to 12 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 AT89LV51 is a low-voltage, high-performance CMOS 8-bit microcomputer with 4K bytes of Flash Programmable and Erasable Read Only Memory. The device is manufactured using Atmel’s high density nonvolatile memory technology and is com- patible 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 conven- tional nonvolatile memory programmer. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89LV51 is a powerful microcomputer which pro- vides a highly flexible and cost effective solution to many embedded control applica- tions. The AT89LV51 operates at 2.7 volts up to 6.0 volts. TQFP 23 1 INDEX CORNER 34 P1.0VCCP1.1 P1.2 P1.4 P1.3 NC 42 43 40 41 6 5 4 44 3 2 26 25 28 27 24 18 19 20 21 22 P1.7 P1.6 P1.5 NC 7 8 9 10 11 12 13 14 15 16 17 29 30 39 38 37 36 35 33 32 31 NC PSEN XTAL1 GND XTAL2 GND P0.0 (AD0) ALE/PROG ()P3.7 RD EA/VPP ()P3.6 WR (RXD) P3.0 P0.7 (AD7) P2.6 (A14) P0.6 (AD6) P0.5 (AD5) P0.4 (AD4) P0.3 (AD3) P0.2 (AD2) P0.1 (AD1) ()P3.2INT0 (TXD) P3.1 (T1) P3.5 ()P3.3INT1 (T0) P3.4 P2.7 (A15) (A11) P2.3 (A12) P2.4 (A10) P2.2 (A9) P2.1 (A8) P2.0 RST P2.5 (A13) PDIP P1.0VCC P1.1 P0.0 (AD0) P1.2 ()P3.2INT0 ALE/PROG ()P3.7RDP2.3 (A11) (TXD) P3.1 EA/VPP ()P3.6WR P2.4 (A12) (RXD) P3.0 P0.7 (AD7) (T1) P3.5 P2.6 (A14) RST P0.6 (AD6) P1.7 P0.5 (AD5) P1.6 P0.4 (AD4) P1.5 P0.3 (AD3) P1.4 P0.2 (AD2) P1.3 P0.1 (AD1) ()P3.3INT1 PSEN XTAL2P2.2 (A10) (T0) P3.4 P2.7 (A15) XTAL1P2.1 (A9) GNDP2.0 (A8) P2.5 (A13) 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 21 22 23 24 25 26 40 39 38 37 36 35 34 33 32 31 30 29 28 27 PLCC P1.0 VCC P1.1 P0.0 (AD0) P1.2 ALE/PROG ()P3.7 RD XTAL1 EA/VPP ()P3.6 WR GND (RXD) P3.0 P0.7 (AD7) P2.6 (A14) P0.6 (AD6) P0.5 (AD5) P0.4 (AD4) P0.3 (AD3) P1.4 P0.2 (AD2) P1.3 P0.1 (AD1) PSEN XTAL2 ()P3.2INT0 (TXD) P3.1 (T1) P3.5 ()P3.3INT1 (T0) P3.4 P2.7 (A15) (A11) P2.3 (A12) P2.4 (A10) P2.2 (A9) P2.1 (A8) P2.0 NC 23 1 RST P1.7 P1.6 P1.5 INDEX CORNER NC NC P2.5 (A13) 34 NC 42 43 40 41 6 5 444 3 2 26 25 28 27 18 19 2024 21 22 7 8 9 10 11 12 13 14 15 16 1729 30 39 38 37 36 35 33 32 31 8-Bit Microcontroller with 4K Bytes Flash AT 8 9 LV 5 1 Pin Configurations 0303D-D–12/97 (continued)
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