RM0008 USB full speed device interface (USB)
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Transmission buffer address n (USB_ADDRn_TX)
Address offset: [USB_BTABLE] + n*16
USB local address: [USB_BTABLE] + n*8
Transmission byte count n (USB_COUNTn_TX)
Address offset: [USB_BTABLE] + n*16 + 4
USB local Address: [USB_BTABLE] + n*8 + 2
Note: Double-buffered and Isochronous IN Endpoints have two USB_COUNTn_TX
registers: named USB_COUNTn_TX_1 and USB_COUNTn_TX_0 with the
following content.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
ADDRn_TX[15:1] -
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw -
Bits 15:1 ADDRn_TX[15:1]: Transmission Buffer Address
These bits point to the starting address of the packet buffer containing data to be transmitted by the
endpoint associated with the USB_EPnR register at the next IN token addressed to it.
Bit 0 Must always be written as ‘0’ since packet memory is word-wide and all packet buffers must be word-
aligned.
151413121110987654321 0
- COUNTn_TX[9:0]
rw rw rw rw rw rw rw rw rw rw
Bits 15:10 These bits are not used since packet size is limited by USB specifications to 1023 bytes. Their value is
not considered by the USB peripheral.
Bits 9:0 COUNTn_TX[9:0]: Transmission Byte Count
These bits contain the number of bytes to be transmitted by the endpoint associated with the
USB_EPnR register at the next IN token addressed to it.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
- COUNTn_TX_1[9:0]
- - - - - - rw rw rw rw rw rw rw rw rw rw
151413121110987654321 0
- COUNTn_TX_0[9:0]
- - - - - - rw rw rw rw rw rw rw rw rw rw
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