A 470 ohm pull-up resistor is provided on board. The registers are mapped as 16 bit words and are read-writeable. The registers are mapped as 16 bit words. All registers are read-writeable. All 48 IO channels can be used as interrupt generators.
Interrupts are programmable to be enabled, active high or low, and edge or level triggered.
The Timing can be altered with a change to the state-machine for other implementations. The state machine has counters to create the delays for each state. RW is high as a default and for read accesses. RW is asserted low for a write cycle. You must have Adobe Acrobat 3.x to read our PDF files.