UPD31172 Description
The µPD31172 (mercial name: VRC4172) is a panion chip designed for NEC’s µPD30121 microprocessor (mercial name: The VRC4172 has the following functions available on chip:.
UPD31172 Key Features
- Directly connectable to VR4121
- On-chip USB host controller
- USB ports: 2
- pliant with the USB OpenHCI specifications, release 1.0
- municates with USB device asynchronously with host CPU
- Full-speed (12 Mbps) and low-speed (1.5 Mbps) modes supported
- System clock: 48 MHz
- On-chip PS/2 controller
- On-chip IEEE1284 parallel controller
- On-chip 16550 serial controller