• “Change of state” interrupt function for DI
• Programmable digital filter function for DI
• Buffered circuits for higher driving capacity than the 8255
• Interrupt handling capability
• Timer/Counter interrupt capability
• Supports both dry and wet contact
• Keeps the I/O port setting and DO state after system reset
• BoardID switch
• Pattern match interrupt function for DI
• 48 TTL digital I/O lines
• Emulates mode 0 of 8255 PPI (every port with nibble)