upto 512KBytes on-chip Flash In System Programmable (ISP) Memory.
upto 58KBytes on-chip SRAM.
Select between Normal Mode and ISP Program Mode with a switch or automatically.
Upto 4 total UARTs, upto 2 available as RS232 port (3 wire).
Includes Serial communication cable for connecting to computer's COM port.
14/15/16 pin connector for LCD (4 bit interface using on-chip port pins).
Optional LCD BackLighting Control via port pin.
On-chip flash can be erased / re-programmed sector-by-sector, so it can be used for storing program as well as non-volatile data.
Some models include on-chip RTC with battery backup (works even when power is switched off, provided it is initialized appropriately by software).
Unused port pins are brought out on a connector (3.3V level digital I/O, but most pins are 5V tolerant).
Upto 16 Analog Inputs (10 bit resolution).
Some models include 1 Analog output (10 bit resolution).
Some models provide USB (device) interface
Some models provide upto 2 CAN interfaces
Some models provide Ethernet (10/100 Mbps) interface
Includes power adaptor (requires 230VAC), on-board regulators generate 5VDC, 3.3VDC and (optionally) 1.8VDC