ST STM32G4 Series Reference Manual page 2076

USB Type-C™ / USB Power Delivery interface (UCPD)
Bits 31:10 Reserved, must be kept at reset value.
Bits 9:0 RXPAYSZ[9:0]: Rx payload size received
This bitfield contains the number of bytes of a payload (including header but excluding CRC)
received: each time a new data byte is received in the UCPD_RXDR register, the bitfield
value increments and the RXMSGEND flag is set (and an interrupt generated if enabled).
0x2: 2 bytes - the size of Control message from the protocol layer
0x6: 6 bytes - the shortest Data message allowed from the protocol layer)
0x1E: 30 bytes - the longest non-extended Data message allowed from the protocol layer
0x106: 262 bytes - the longest possible extended message
0x3FF: 1024 bytes - the longest possible payload (for future expansion)
The bitfield may return a spurious value when a byte reception is ongoing (the RXMSGEND
flag is low).
46.7.12 UCPD receive data register (UCPD_RXDR)
Address offset: 0x030
Reset value: 0x0000 0000
31 30 29
Res. Res. Res. Res.
15 14 13
Res. Res. Res. Res.
Bits 31:8 Reserved
Bits 7:0 RXDATA[7:0]: Data byte received
46.7.13 UCPD Rx ordered set extension register 1
(UCPD_RX_ORDEXTR1)
Address offset: 0x034
Reset value: 0x0000 0000
Writing to this register is only effective when the peripheral is disabled (UCPDEN = 0).
31 30 29
Res. Res. Res. Res.
15 14 13
rw rw rw
Bits 31:20 Reserved, must be kept at reset value
Bits 19:0 RXSOPX1[19:0]: Ordered set 1 received
The bitfield contains a full 20-bit sequence received, consisting of four K-codes, each of five
bits. The bit 0 (bit 0 of K-code1) is receive first, the bit 19 (bit 4 of K-code4) last.
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28 27 26 25
Res. Res. Res.
12 11 10 9
Res. Res. Res.
28 27 26 25
Res. Res. Res.
12 11 10 9
rw rw rw rw
24 23 22
Res. Res. Res.
8 7 6
Res.
r r
24 23 22
Res. Res. Res.
8 7 6
RXSOPX1[15:0]
rw rw rw
RM0440 Rev 4
21 20 19 18
Res. Res. Res. Res.
5 4 3 2
RXDATA[7:0]
r r r r
21 20 19 18
Res. Res. RXSOPX1[19:16]
5 4 3 2
rw rw rw rw
RM0440
17 16
Res. Res.
1 0
r r
17 16
rw
1 0
rw rw