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ATmega32U2 Datasheet(PDF) 213 Page - ATMEL Corporation |
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ATmega32U2 Datasheet(HTML) 213 Page - ATMEL Corporation |
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213 / 314 page  213 7799B–AVR–07/09 ATmega8U2/16U2/32U2 21.18.5 UDFNUMH – USB Device Frame Number High Register • Bits 7:3 – Res: Reserved These bits are reserved and will always read as zero. • Bits 2:0 – FNUM[10:8]: Frame Number Upper Flag These bits are read-only and updated by the hardware USB controller. These bits contains the 3 MSB of the 11-bits Frame Number information. The content of these bits is updated with the last received SOF packet. These bits are updated even if a corrupted SOF has been received. When a corrupted SOF number is detected, the FNCERR bit of UDMFN is set. 21.18.6 UDFNUML – USB Device Frame Number Low Register • Bits 7:0 – FNUM: Frame Number Lower Flag These bits are read-only and updated by the hardware USB controller. These bits contains the 8 LSB of the 11-bits Frame Number information. The content of these bits is updated with the last received SOF packet. These bits are updated even if a corrupted SOF has been received. When a corrupted SOF number is detected, the FNCERR bit of UDMFN is set. 21.18.7 UDMFN – USB Device Micro Frame Number • Bit 7:5 – Res: Reserved These bits are reserved and will always read as zero. • Bit 4 – FNCERR: Frame Number CRC Error Flag This bit is set by the USB controller when a corrupted frame number in Start of frame packet is received. When an incorrect frame number is detected both SOFI flag and this bit are set. • Bits 3:0 – Res: Reserved These bits are reserved and will always read as zero. Bit 76543 210 (0xE5) ----- FNUM[10:8] UDFNUMH Read/Write RR RRRRRR Initial Value 00000 000 Bit 7 65 43 2 1 0 (0xE4) FNUM[7:0] UDFNUML Read/Write R R R RRR RR Initial Value 0 0 0 0 0 0 0 0 Bit 7 6 5 4 321 0 (0xE6) - - - FNCERR - - - - UDMFN Read/Write R R R R/W R R R R Initial Value 0 0 0 0 0 0 0 0 |
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