ST STM32F207 Series Reference Manual page 1038

Advanced arm-based 32-bit mcus

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USB on-the-go full-speed (OTG_FS)

Bits 31:21 Reserved, must be kept at reset value.

Bits 20:19 PKTCNT: Packet count

Bits 18:7 Reserved, must be kept at reset value.

Bits 6:0 XFRSIZ: Transfer size

Indicates the total number of USB packets that constitute the Transfer Size amount of data

for endpoint 0.

This field is decremented every time a packet (maximum size or short packet) is read from

Indicates the transfer size in bytes for endpoint 0. The core interrupts the application only

after it has exhausted the transfer size amount of data. The transfer size can be set to the

maximum packet size of the endpoint, to be interrupted at the end of each packet.

The core decrements this field every time a packet from the external memory is written to

RM0033 Rev 9

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