RM0444 Rev 5 1343/1390
RM0444 USB Type-C™ / USB Power Delivery interface (UCPD)
1346
38.7.12 UCPD Rx payload size register (UCPD_RX_PAYSZR)
Address offset: 0x02C
Reset value: 0x0000 0000
38.7.13 UCPD receive data register (UCPD_RXDR)
Address offset: 0x030
Reset value: 0x0000 0000
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Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res.
1514131211109876543210
Res. Res. Res. Res. Res. Res. RXPAYSZ[9:0]
rrrrrrrrrr
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).
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res.
1514131211109876543210
Res. Res. Res. Res. Res. Res. Res. Res. RXDATA[7:0]
rrrrrrrr
Bits 31:8 Reserved, must be kept at reset value.
Bits 7:0 RXDATA[7:0]: Data byte received
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