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M30245F8-XXXGP Datasheet(PDF) 11 Page - Renesas Technology Corp |
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M30245F8-XXXGP Datasheet(HTML) 11 Page - Renesas Technology Corp |
11 / 266 page Rev.2.00 Oct 16, 2006 page 11 of 264 M30245 Group Description REJ03B0005-0200 USB Overview The M30245 group is a single-chip PC peripheral microcontroller that is compliant with the Universal Serial Bus (USB) Version 2.0 specification for full-speed USB operation (12Mbps). This device provides an interface between a USB- equipped host computer and PC peripherals such as telephones, audio systems, and digital cameras. The M30245 architectural overview is shown in Figure 1.4. The USB function control unit of the M30245 group supports full-speed operation and all four data transfer types listed in the USB specification. Each transfer type is used for controlling a different set of PC peripherals. • Isochronous transfers provide guaranteed bus access, a constant data rate, and error tolerance for devices such as computer-telephone integration (CTI) and audio systems. • Interrupt transfers are designed to support human input devices (HID) that communicate small amounts of data infrequently. • Bulk transfers are necessary for devices such as digital cameras and scanners that communicate large amounts of data to the PC as bus bandwidth becomes free. • Control transfers are supported and are useful for bursty, host-initiated type communication where bus manage- ment is the primary concern. Figure 1.4. M30245 architectural overview frequency RAM DMAC x 4 M16C CPU UART x 4 Timers x 5 Watchdog CRC Circuit I/O Ports (P0 to P10) FIFOs D+ D- (Normal MCU or DMA Transfer) 1 - 16MHz 48 MHz synthesizer LED Drivers (X 8) A/D Converter Timer ROM |
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