ST STM32F102 Series Reference Manual page 495

RM0008
Transmission buffer address n (USB_ADDRn_TX)
Address offset: [USB_BTABLE] + n*16
USB local address: [USB_BTABLE] + n*8
15 14 13
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.
Transmission byte count n (USB_COUNTn_TX)
Address offset: [USB_BTABLE] + n*16 + 4
USB local Address: [USB_BTABLE] + n*8 + 2
15 14 13
-
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.
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.
31 30 29
-
- - -
15 14 13
-
- - -
12 11 10 9
ADDRn_TX[15:1]
rw rw rw rw
12 11 10 9
rw
28 27 26 25
- - - rw
12 11 10 9
- - - rw
USB full speed device interface (USB)
8 7 6 5
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8 7 6 5
COUNTn_TX[9:0]
rw rw rw rw
24 23 22 21
COUNTn_TX_1[9:0]
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8 7 6 5
COUNTn_TX_0[9:0]
rw rw rw rw
4 3 2 1
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4 3 2 1
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20 19 18 17
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4 3 2 1
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0
-
-
0
rw
16
rw
0
rw
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