MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
21-33
21.4.9
Interrupt Operation
21.4.9.1
Interrupt Sources
There are several interrupt sources that can generate an eSCI interrupt to the CPU. They are listed with
details and descriptions in
.
The eSCI only originates interrupt requests. The following sections describe how the eSCI generates a
request and how the MCU acknowledges that request. The eSCI only has a single interrupt line (eSCI
interrupt signal, active high operation) and all the following interrupts, when generated, are ORed together
and issued through that port.
Table 21-21. eSCI Interrupt Flags, Sources, Mask Bits, and Descriptions
Interrupt
Source
Flag
Source
Local
Enable
Description
Transmitter
TDRE
ESCIx_SR[0]
TIE
Indicates that a byte was transferred from
ESCIx_DR to the transmit shift register.
Transmitter
TC
ESCIx_SR[1]
TCIE
Indicates that a transmit is complete.
Receiver
RDRF
ESCIx_SR[2]
RIE
Indicates that received data is available in the
eSCI data register.
Receiver
IDLE
ESCIx_SR[3]
ILIE
Indicates that receiver input has become idle.
Receiver
OR
ESCIx_SR[4]
ORIE
Indicates that an overrun condition has occurred.
Receiver
NF
ESCIx_SR[5]
NFIE
Detect noise error on receiver input.
Receiver
FE
ESCIx_SR[6]
FEIE
Framing error has occurred.
Receiver
PF
ESCIx_SR[7]
PFIE
Parity of received data does not match parity bit;
parity error has occurred.
LIN
BERR
ESCIx_SR[11]
IEBERR
Detected a bit error, only valid in LIN mode.
LIN
RXRDY
ESCIx_SR[16]
RXIE
Indicates LIN hardware has received a data byte.
LIN
TXRDY
ESCIx_SR[17]
TXIE
Indicates LIN hardware can accept a control or
data byte.
LIN
LWAKE
ESCIx_SR[18]
WUIE
A wake-up character has been received from a
LIN frame.
LIN
STO
ESCIx_SR[19]
STIE
The response of the slave has been too slow
(slave timeout).
LIN
PBERR
ESCIx_SR[20]
PBIE
Physical bus error detected.
LIN
CERR
ESCIx_SR[21]
CIE
CRC error detected.
LIN
CKERR
ESCIx_SR[22]
CKIE
Checksum error detected.
LIN
FRC
ESCIx_SR[23]
FCIE
LIN frame completed.
LIN
OVFL
ESCIx_SR[31]
OFIE
ESCIx_LRR overflow.
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