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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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AT89C5131A-RDTIM Datenblatt(PDF) 148 Page - ATMEL Corporation |
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AT89C5131A-RDTIM Datenblatt(HTML) 148 Page - ATMEL Corporation |
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148 / 186 page  148 AT89C5130A/31A-M 4337G–USB–11/06 Table 105. UFNUMH Register UFNUMH (S:BBh, read-only) USB Frame Number High Register Reset Value = 00h Table 106. UFNUML Register UFNUML (S:BAh, read-only) USB Frame Number Low Register Reset Value = 00h 765 43210 - - CRCOK CRCERR - FNUM10 FNUM9 FNUM8 Bit Number Bit Mnemonic Description 5 CRCOK Frame Number CRC OK This bit is set by hardware when a new Frame Number in Start of Frame Packet is received without CRC error. This bit is updated after every Start of Frame packet receipt. Important note: the Start of Frame interrupt is generated just after the PID receipt. 4 CRCERR Frame Number CRC Error This bit is set by hardware when a corrupted Frame Number in Start of Frame packet is received. This bit is updated after every Start of Frame packet receipt. Important note: the Start of Frame interrupt is generated just after the PID receipt. 3- Reserved The value read from this bit is always 0. Do not set this bit. 2-0 FNUM[10:8] Frame Number FNUM[10:8] are the upper 3 bits of the 11-bit Frame Number (see the “UFNUML Register UFNUML (S:BAh, read-only) USB Frame Number Low Register” on page 148). It is provided in the last received SOF packet (see SOFINT in the “USBIEN Register USBIEN (S:BEh) USB Global Interrupt Enable Register” on page 139). FNUM is updated if a corrupted SOF is received. 765 43210 FNUM7 FNUM6 FNUM5 FNUM4 FNUM3 FNUM2 FNUM1 FNUM0 Bit Number Bit Mnemonic Description 7 - 0 FNUM[7:0] Frame Number FNUM[7:0] are the lower 8 bits of the 11-bit Frame Number (See “UFNUMH Register UFNUMH (S:BBh, read-only) USB Frame Number High Register” on page 148.). |
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