ST STM32G0 1 Series Reference Manual page 1337

RM0444
Bits 31:21 Reserved, must be kept at reset value.
Bit 20 FRSEVT: FRS detection event
The flag is cleared by setting the FRSEVTCF bit.
0: No new event
1: New FRS receive event occurred
Bits 19:18 TYPEC_VSTATE_CC2[1:0]: CC2 line voltage level
The status bitfield indicates the voltage level on the CC2 line in its steady state.
0x0: Lowest
0x1: Low
0x2: High
0x3: Highest
The voltage variation on the CC2 line during USB PD messages due to the BMC PHY
modulation does not impact the bitfield value.
Bits 17:16 TYPEC_VSTATE_CC1[1:0]:
The status bitfield indicates the voltage level on the CC1 line in its steady state.
0x0: Lowest
0x1: Low
0x2: High
0x3: Highest
The voltage variation on the CC1 line during USB PD messages due to the BMC PHY
modulation does not impact the bitfield value.
Bit 15 TYPECEVT2: Type-C voltage level event on CC2 line
The flag indicates a change of the TYPEC_VSTATE_CC2[1:0] bitfield value, which
corresponds to a new Type-C event. It is cleared by setting the TYPECEVT2CF bit.
0: No new event
1: A new Type-C event
Bit 14 TYPECEVT1: Type-C voltage level event on CC1 line
The flag indicates a change of the TYPEC_VSTATE_CC1[1:0] bitfield value, which
corresponds to a new Type-C event. It is cleared by setting the TYPECEVT2CF bit.
0: No new event
1: A new Type-C event
Bit 13 RXERR: Receive message error
The flag indicates errors of the last Rx message declared (via RXMSGEND), such as
incorrect CRC or truncated message (a line becoming static before EOP is met). It is
asserted whenever the RXMSGEND flag is set.
0: No error detected
1: Error(s) detected
Bit 12 RXMSGEND: Rx message received
The flag indicates whether a message (except Hard Reset message) has been received,
regardless the CRC value. The flag is cleared by setting the RXMSGENDCF bit.
0: No new Rx message received
1: A new Rx message received
The RXERR flag set when the RXMSGEND flag goes high indicates errors in the last-
received message.
Bit 11 RXOVR: Rx data overflow detection
The flag indicates Rx data buffer overflow. It is cleared by setting the RXOVRCF bit.
0: No overflow
1: Overflow
The buffer overflow can occur if the received data are not read fast enough.
USB Type-C™ / USB Power Delivery interface (UCPD)
RM0444 Rev 5 1337/1390
1346