52.4.8.2 Infrared receive decoder
The infrared receive block converts data from the RXD signal to the receive shift register.
A narrow pulse is expected for each zero received and no pulse is expected for each one
received. A narrow high pulse is expected for a zero bit when S2[RXINV] is cleared,
while a narrow low pulse is expected for a zero bit when S2[RXINV] is set. This receive
decoder meets the edge jitter requirement as defined by the IrDA serial infrared physical
layer specification.
52.5 Reset
All registers reset to a particular value are indicated in
.
52.6 System level interrupt sources
There are several interrupt signals that are sent from the UART. The following table lists
the interrupt sources generated by the UART. The local enables for the UART interrupt
sources are described in this table. Details regarding the individual operation of each
interrupt are contained under various sub-sections of
.
also outlines additional details regarding the RXEDGIF
interrupt because of its complexity of operation. Any of the UART interrupt requests
listed in the table can be used to bring the CPU out of wait mode.
Table 52-238. UART interrupt sources
Interrupt Source
Flag
Local enable
DMA select
Transmitter
TDRE
TIE
TDMAS = 0
Transmitter
TC
TCIE
-
Receiver
IDLE
ILIE
-
Receiver
RDRF
RIE
RDMAS = 0
Receiver
LBKDIF
LBKDIE
-
Receiver
RXEDGIF
RXEDGIE
-
Receiver
OR
ORIE
-
Receiver
NF
NEIE
-
Receiver
FE
FEIE
-
Receiver
PF
PEIE
-
Receiver
RXUF
RXUFE
-
Transmitter
TXOF
TXOFE
-
Table continues on the next page...
Chapter 52 Universal Asynchronous Receiver/Transmitter (UART)
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
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