AT89LP828-20PU [Microchip]

The AT89LP428/828 is built around an enhanced CPU core that can fetch a single byte from memory every clock cycle, providing 6 to 12 times more throughput than the standard 8051. It features 4K/8K bytes of ISP Flash program memory, 512/1024 bytes of Flash data memory, 768 bytes of RAM, up to 30 I/O lines, three 16-bit timer/counters, up to six PWM outputs, a programmable watchdog timer, two analog comparators, a full-duplex serial port, a serial peripheral interface, an internal RC oscillator, on-chip crystal oscillator, and a four-level, ten-vector interrupt system. The I/O ports can be independently configured in one of four operating modes: quasi-bidirectional, input-only, push-pull CMOS output, or open-drain.