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1 Pin Configuration PDIP/SOIC 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 RST/VPP (RXD) P3.0 (TXD) P3.1 XTAL2 XTAL1 (INT0) P3.2 (INT1) P3.3 (T0) P3.4 (T1) P3.5 GND VCC P1.7 P1.6 P1.5 P1.4 P1.3 P1.2 P1.1 (AIN1) P1.0 (AIN0) P3.7 Features • Compatible with MCS-51 ™ Products • 1K Bytes of Reprogrammable Flash Memory – Endurance: 1,000 Write/Erase Cycles • 2.7V to 6V Operating Range • Fully Static Operation: 0 Hz to 24 MHz • Two-Level Program Memory Lock • 64 x 8-Bit Internal RAM • 15 Programmable I/O Lines • Two 16-Bit Timer/Counters • Six Interrupt Sources • Programmable Serial UART Channel • Direct LED Drive Outputs • On-Chip Analog Comparator • Low Power Idle and Power Down Modes Description The AT89C1051U is a low-voltage, high-performance CMOS 8-bit microcomputer with 1K bytes of Flash programmable and erasable read only memory. It has the same functionality and operation as the AT89C1051 with the addition of a UART program- mable serial port. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry standard MCS-51 ™ instruction set. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C1051U is a powerful microcomputer which provides a highly flexible and cost effective solution to many embedded control applications. The AT89C1051U provides the following standard features: 1K bytes of Flash, 64 bytes of RAM, 15 I/O lines, two 16-bit timer/counters, a five-vector, two-level interrupt architecture, a full duplex serial port, a precision analog comparator, on-chip oscillator and clock circuitry. In addition, the AT89C1051U is designed with static logic for oper- ation down to zero frequency and supports two software-selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port and interrupt system to continue functioning. The Power Down Mode saves the RAM contents but freezes the oscillator disabling all other chip functions until the next hardware reset. Rev. 1045A–05/98 8-Bit Microcontroller with 1K Bytes Flash AT89C1051U Preliminary