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AT90USB646 Datasheet(PDF) 304 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 304 Page - ATMEL Corporation |
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304 / 459 page  304 7593H–AVR–11/08 ATmega32U6/AT90USB64/128 - 00: 1 bank - 01: 2 banks - 10: invalid - 11: invalid • ALLOC Configure Pipe Memory Set to configure the pipe memory with the characteristics. Clear to update the memory allocation. Refer to the Memory Management chapter for more details. 7 - Reserved The value read from these bits is always 0. Do not set these bits. • 7 - INTFRQ7:0 - Interrupt Pipe Request Frequency These bits are the maximum value in millisecond of the polling period for an Interrupt Pipe. This value has no effect for a non-Interrupt Pipe. • 7 - CFGOK - Configure Pipe Memory OK Set by hardware if the required memory configuration has been successfully performed. Cleared by hardware when the pipe is disabled. The USB reset and the reset pipe have no effect on the configuration of the pipe. • 6 - OVERFI - Overflow Set by hardware when a the current Pipe has received more data than the maximum length of the current Pipe. An interrupt is triggered if the FLERRE bit is set. Shall be cleared by software. Setting by software has no effect. • 5 - UNDERFI - Underflow Set by hardware when a transaction underflow occurs in the current isochronous or interrupt Pipe. The Pipe can’t send the data flow required by the device. A ZLP will be sent instead. An interrupt is triggered if the FLERRE bit is set. Shall be cleared by software. Setting by software has no effect. Bit 76543210 INTFRQ7 INTFRQ6 INTFRQ5 INTFRQ4 INTFRQ3 INTFRQ2 INTFRQ1 INTFRQ0 UPCFG2X Read/Write RW RW RW RW RW RW RW RW Initial Value 00000000 Bit 7 6 543 2 1 0 CFGOK OVERFI UNDERFI - DTSEQ1:0 NBUSYBK UPSTAX Read/Write R RW RW R R R R Initial Value 0 0 0 0 0 0 0 0 |
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