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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
21-11
4
OR
Overrun flag. OR is set when software fails to read the eSCI data register before the
receive shift register receives the next frame. The OR bit is set immediately after the stop
bit has been completely received for the second frame. The data in the shift register is
lost, but the data already in the eSCI data registers is not affected. Clear OR by writing
1 to it.
0 No overrun
1 Overrun
5
NF
Noise flag. NF is set when the eSCI detects noise on the receiver input. NF bit is set
during the same cycle as the RDRF flag but does not get set in the case of an overrun.
Clear NF by writing 1 to it.
0 No noise
1 Noise
6
FE
Framing error flag. FE is set when a logic 0 is accepted as the stop bit. FE bit is set during
the same cycle as the RDRF flag but does not get set in the case of an overrun. Clear
FE by writing 1 to it.
0 No framing error
1 Framing error
7
PF
Parity error flag. PF is set when the parity enable bit, PE, is set and the parity of the
received data does not match its parity bit. Clear PE by writing 1 to it.
0 No parity error
1 Parity error
8–10
—
Reserved, should be cleared.
11
BERR
Bit error. Indicates a bit on the bus did not match the transmitted bit. If FBR = 0, checking
happens after a complete byte has been transmitted and received again. If FBR = 1,
checking happens bit by bit. This bit is only used for LIN mode.
BERR is also set if an unrequested byte is received (i.e. a byte that is not part of an RX
frame) that is not recognized as a wake-up flag. (Because the data on the RX line does
not match the idle state that was assigned to the TX line.)
Clear BERR by writing 1 to it.
A bit error causes the LIN finite state machine (FSM) to reset unless ESCIx_LCR[LDBG]
is set.
12–14
—
Reserved.
15
RAF
Receiver active flag. RAF is set when the receiver detects a logic 0 during the RT1 time
period of the start bit search. RAF is cleared when the receiver detects an idle character.
0 No reception in progress.
1 Reception in progress.
16
RXRDY
The eSCI has received LIN data. This bit is set when the ESCIx_LCR receives a byte.
Clear RXRDY by writing it with 1.
17
TXRDY
The LIN FSM can accept another write to ESCIx_LTR. This bit is set when the
ESCIx_LTR register becomes free. Clear TXRDY by writing it with 1.
18
LWAKE
Received LIN wake-up signal. A LIN slave has sent a wake-up signal on the bus. When
this signal is detected, the LIN FSM will reset. If the setup of a frame had already started,
it therefore must be repeated.
LWAKE will also be set if ESCI receives a LIN 2.0 wake-up signal (in which the baud rate
is lower than 32K baud). See the WU bit.
Table 21-6. ESCIx_SR Field Descriptions (Continued)
Bits
Name
Description
Содержание MPC5553
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