What are the capabilities of the HC908 Daughtercard?
The HC908 card is a 2 x 2 pluggable daughtercard containing the 8-bit 68HC908AB32 microcontroller on the topside; and the clock, voltage regulator and an RS232 serial port driver on the bottom side. The 68HC908 MCU has 32KB of flash memory, 1 KB of RAM, 512 bytes of EEPROM, 51 general purpose I/O pins, an 8-channel 8-bit A/D converter, two 16-bit timer ports, a programmable interrupt timer, and has a powerful CISC instruction set that can be programmed in assembly language of in C. By pressing the pushbutton on the top, the user instructs the HC908 card to load a new software program from a PC connected to the RS232 serial port. The red LED on the topside turns on to indicate that the HC908 card is awaiting connection to the PC. Once a specific software program is loaded, the power can be removed and the HC908 card retains the program. When power is applied again, it starts running the new program. All of the 51 I/O pins on the microcontroller are available for any custom circuit you m
