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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.