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PIC16C765/P Datasheet(PDF) 70 Page - Microchip Technology |
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PIC16C765/P Datasheet(HTML) 70 Page - Microchip Technology |
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70 / 158 page  PIC16C745/765 DS41124A-page 70 Advanced Information © 1999 Microchip Technology Inc. REGISTER 10-12: BUFFER DESCRIPTOR BYTE COUNT (BDndBC: 1A1h, 1A5h, 1A9h, 1ADh, 1B1h, 1B5h)) REGISTER 10-13: BUFFER DESCRIPTOR ADDRESS LOW (BDndAL: 1A2h, 1A6h, 1AAh, 1AEh, 1B2h, 1B6h) 10.6.1 ENDPOINT BUFFERS Endpoint buffers are located in the Dual Port RAM area. The starting location of an endpoint buffer is determined by the Buffer Descriptor. 10.7 TRANSCEIVER An on-chip integrated transceiver is included to drive the D+/D- physical layer of the USB. 10.7.1 REGULATOR A 3.3V regulator provides the D+/D- drives with power. A +20% 10nF capacitor is required on VUSB for regula- tor stability. 10.7.1.1 VUSB Output The VUSB provides a 3.3V nominal output. This drive current is sufficient for a pull-up only. 10.8 USB Software Libraries Microchip Technology provides a comprehensive set of Chapter 9 Standard requests functions to aid devel- opers in implementing their designs. See Microchip Technology’s website for the latest version of the soft- ware libraries. TABLE 10-1: USB PORT FUNCTIONS U-X U-X U-X U-X R/W-X R/W-X R/W-X R/W-X — — — — BC3 BC2 BC1 BC0 R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR reset X = Don’t care bit7 bit0 bit 7-4: Reserved: Read as ’X’. bit 3-0: BC<3:0>: The Byte Count bits represent the number of bytes that will be transmitted for an IN TOKEN or received during an OUT TOKEN. Valid byte counts are 0 - 8. The SIE will change this field upon the com- pletion of an OUT or SETUP token with the actual byte count of the data received. R/W-X R/W-X R/W-X R/W-X R/W-X R/W-X R/W-X R/W-X BA7 BA6 BA5 BA4 BA3 BA2 BA1 BA0 R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR reset X = Don’t care bit7 bit0 bit 7-0: BA<7:0>: Buffer Address. The base address of the buffer controlled by this endpoint. The upper order bit address (BA8) of the 9-bit address is assumed to be 1h. This value must point to a location within the dual port memory space (1B8h - 1DFh). The upper order bits of the address are assumed to point to Bank 3. Note 1: This register should always contain a value between B8h-DFh. Name Function Input Type Output Type Description VUSB VUSB — Power 3.3V for pull up resistor D- D- USB USB USB Differential Bus D+ D+ USB USB USB Differential Bus Legend: OD = open drain, ST = Schmitt Trigger |
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