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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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STR720 Datasheet(PDF) 288 Page - STMicroelectronics |
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STR720 Datasheet(HTML) 288 Page - STMicroelectronics |
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288 / 401 page  STR720 - USB SLAVE INTERFACE (USB) 288/401 USB Frame Number Register (USB_FNR) Address Offset: 48h Reset Value: 0000 0xxx xxxx xxxx (0xxxh) 15 14 13 12 11 10 9 8 76 54321 0 LSOF[1:0] FN[10:0] rr r r r Bit 15 RXDP Receive Data + Line Status This bit can be used to observe the status of received data plus upstream port data line. It can be used during end-of-suspend routines to help determining the wake-up event. Bit 14 RXDM. Receive Data - Line Status This bit can be used to observe the status of received data minus upstream port data line. It can be used during end-of-suspend routines to help determining the wake-up event. Bit 13 LCK: Locked This bit is set by the hardware when at least two consecutive SOF packets have been received after the end of an USB reset condition or after the end of an USB resume sequence. Once locked, the frame timer remains in this state until an USB reset or USB suspend event occurs. Bits12:11 LSOF[1:0]: Lost SOF These bits are written by the hardware when an ESOF interrupt is generated, counting the number of consecutive SOF packets lost. At the reception of an SOF packet, these bits are cleared. Bits 10:0 FN[10:0]: Frame Number This bit field contains the 11-bits frame number contained in the last received SOF packet. The frame number is incremented for every frame sent by the host and it is useful for Isochronous transfers. This bit field is updated on the generation of an SOF interrupt. 1 |
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