UPD31172

DATA SHEET MOS INTEGRATED CIRCUIT µPD31172 VRC4172 TM COMPANION CHIP FOR VR4121 TM 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. Detailed function descriptions are provided in the following user’s manual. Be sure to read it before designing. VRC4172 User’s Manual (U14386E) 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 B...