AT89C55WD is retire from our product list. This listing is for reference only. We have lots of new 8051/8052 compatible products to chose from.
The AT89C55WD provides the following standard features: 20K bytes of Flash, 256
bytes of RAM, 32 I/O lines, three 16-bit timer/counters, a six-vector, two-level interrupt
architecture, a full-duplex serial port, on-chip oscillator, and clock circuitry.