AT89C2051 has the following characteristics: 2 k bytes EPROM, 128 bytes RAM, 15 I / O lines, two 16-bit timers / counters, five vector two interrupt structure, a full two-way serial port, and includes precision analog comparator and on-chip oscillator, a 4.25 V to 5.5 V voltage scope of work and 12 MHz/24MHz frequency, and also offers the encryption array of two program memory locking, power-down and the clock circuit. 其中,“EPROM”是 的缩写, 翻译是 ;“RAM”是 的缩写,翻译是 ;“I/O” stands for ; “interrupt structure”翻译是 ;“on-chip oscillator”翻译是 。