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LPUARTx_STAT field descriptions (continued)
Field
Description
19
OR
Receiver Overrun Flag
OR is set when software fails to prevent the receive data register from overflowing with data. The OR bit is
set immediately after the stop bit has been completely received for the dataword that overflows the buffer
and all the other error flags (FE, NF, and PF) are prevented from setting. The data in the shift register is
lost, but the data already in the LPUART data registers is not affected. If LBKDE is enabled and a LIN
Break is detected, the OR field asserts if LBKDIF is not cleared before the next data character is received.
While the OR flag is set, no additional data is stored in the data buffer even if sufficient room exists. To
clear OR, write logic 1 to the OR flag.
0
No overrun.
1
Receive overrun (new LPUART data lost).
18
NF
Noise Flag
The advanced sampling technique used in the receiver takes three samples in each of the received bits. If
any of these samples disagrees with the rest of the samples within any bit time in the frame then noise is
detected for that character. NF is set whenever the next character to be read from LPUART_DATA was
received with noise detected within the character. To clear NF, write logic one to the NF.
0
No noise detected.
1
Noise detected in the received character in LPUART_DATA.
17
FE
Framing Error Flag
FE is set whenever the next character to be read from LPUART_DATA was received with logic 0 detected
where a stop bit was expected. To clear FE, write logic one to the FE.
0
No framing error detected. This does not guarantee the framing is correct.
1
Framing error.
16
PF
Parity Error Flag
PF is set whenever the next character to be read from LPUART_DATA was received when parity is
enabled (PE = 1) and the parity bit in the received character does not agree with the expected parity
value. To clear PF, write a logic one to the PF.
0
No parity error.
1
Parity error.
15
MA1F
Match 1 Flag
MA1F is set whenever the next character to be read from LPUART_DATA matches MA1. To clear MA1F,
write a logic one to the MA1F.
0
Received data is not equal to MA1
1
Received data is equal to MA1
14
MA2F
Match 2 Flag
MA2F is set whenever the next character to be read from LPUART_DATA matches MA2. To clear MA2F,
write a logic one to the MA2F.
0
Received data is not equal to MA2
1
Received data is equal to MA2
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
Chapter 31 Low Power Universal Asynchronous Receiver/Transmitter (LPUART)
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors
821
Содержание K32 L2A Series
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