DESCRIPTION

The µPD31172 (commercial name: VRC4172) is a companion chip designed for NEC’s µPD30121 microprocessor (commercial name: VR4121).

The VRC4172 has the following functions available on chip: a USB host controller, an IEEE1284 parallel controller, a 16550 serial controller, a PS/2 controller, general-purpose ports (GPIO), programmable chip select (PCS), and a PWM controller (a duty modulated light pulse generation function for LCD backlighting).

The VRC4172 can be directly connected to the VR4121, allowing a reduction in the man-hours required for development of a Windows™ CE system.

FEATURES

• Directly connectable to VR4121

• On-chip USB host controller

• USB ports: 2

• Compliant with the USB OpenHCI specifications, release 1.0

• Communicates 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

• General-purpose ports (GPIO): 24

• On-chip PWM controller

• Duty modulated light pulse generation function for LCD backlighting

• Internal maximum operating frequency: 48 MHz

• Power supply voltage: VDD = 3.3 V ± 0.3 V

• Package: 208-pin plastic FBGA

APPLICATIONS

• Battery-driven portable information devices

• Peripheral devices for PCs, etc.