DA14582_16 Datasheet, PDF (72/172 Pages) Dialog Semiconductor – Bluetooth Low Energy 4.2 SoC with Audio CODEC

DA14582
Bluetooth Low Energy 4.2 SoC with Audio CODEC
FINAL
Table 89: UART2_LSR_REG (0x50001114)
Bit
Mode Symbol
3
r
UART_FE
2
r
UART_PE
1
r
UART_OE
0
r
UART_DR
Description
Framing Error bit.
This is used to indicate the occurrence of a framing error in
the receiver. A framing error occurs when the receiver does
not detect a valid STOP bit in the received data.
In the FIFO mode, since the framing error is associated with
a character received, it is revealed when the character with
the framing error is at the top of the FIFO.
When a framing error occurs, the UART tries to resynchro-
nize. It does this by assuming that the error was due to the
start bit of the next character and then continues receiving
the other bit i.e. data, and/or parity and stop. It should be
noted that the Framing Error (FE) bit (LSR[3]) is set if a
break interrupt has occurred, as indicated by Break Interrupt
(BI) bit (LSR[4]).
0 = no framing error
1 = framing error
Reading the LSR clears the FE bit.
Parity Error bit.
This is used to indicate the occurrence of a parity error in the
receiver if the Parity Enable (PEN) bit (LCR[3]) is set.
In the FIFO mode, since the parity error is associated with a
character received, it is revealed when the character with the
parity error arrives at the top of the FIFO.
It should be noted that the Parity Error (PE) bit (LSR[2]) is
set if a break interrupt has occurred, as indicated by Break
Interrupt (BI) bit (LSR[4]).
0 = no parity error
1 = parity error
Reading the LSR clears the PE bit.
Overrun error bit.
This is used to indicate the occurrence of an overrun error.
This occurs if a new data character was received before the
previous data was read.
In the non-FIFO mode, the OE bit is set when a new charac-
ter arrives in the receiver before the previous character was
read from the RBR. When this happens, the data in the RBR
is overwritten. In the FIFO mode, an overrun error occurs
when the FIFO is full and a new character arrives at the
receiver. The data in the FIFO is retained and the data in the
receive shift register is lost.
0 = no overrun error
1 = overrun error
Reading the LSR clears the OE bit.
Data Ready bit.
This is used to indicate that the receiver contains at least
one character in the RBR or the receiver FIFO.
0 = no data ready
1 = data ready
This bit is cleared when the RBR is read in non-FIFO mode,
or when the receiver FIFO is empty, in FIFO mode.
Reset
0x0
0x0
0x0
0x0
Table 90: UART2_MSR_REG (0x50001118)
Bit
Mode Symbol
15:8 -
-
Description
Reserved
Reset
0x0
Datasheet
CFR0011-120-01
Revision 3.0
72 of 172
08-Nov-2016
© 2015 Dialog Semiconductor