48 channels of TTL digital I/O
Simulate 8255 PPI mode 0
Provides a higher drive capacity buffer circuit than the 8255
3-channel timer/counter
Interrupt response capabilities
DO supports wet and dry contacts
The system maintains I/O port settings and DO status after reboot
DI pattern matching and state-changing interrupting capabilities
DI channel programmable digital filtering
DO output state readback
DI's programmable digital filtering function
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