LM3S9B90 Datasheet, PDF (616/1185 Pages) Texas Instruments – Stellaris® LM3S9B90 Microcontroller

Universal Asynchronous Receivers/Transmitters (UARTs)
3. Write the fractional portion of the BRD to the UARTFBRD register.
4. Write the desired serial parameters to the UARTLCRH register (in this case, a value of
0x0000.0060).
5. Optionally, configure the µDMA channel (see “Micro Direct Memory Access (μDMA)” on page 267)
and enable the DMA option(s) in the UARTDMACTL register.
6. Enable the UART by setting the UARTEN bit in the UARTCTL register.
15.5
Register Map
Table 15-4 on page 616 lists the UART registers. The offset listed is a hexadecimal increment to the
register’s address, relative to that UART’s base address:
■ UART0: 0x4000.C000
■ UART1: 0x4000.D000
■ UART2: 0x4000.E000
Note that the UART module clock must be enabled before the registers can be programmed (see
page 178).
Note: The UART must be disabled (see the UARTEN bit in the UARTCTL register on page 631)
before any of the control registers are reprogrammed. When the UART is disabled during
a TX or RX operation, the current transaction is completed prior to the UART stopping.
Table 15-4. UART Register Map
Offset Name
Type
0x000
0x004
0x018
0x020
0x024
0x028
0x02C
0x030
0x034
0x038
0x03C
0x040
0x044
0x048
0x090
0x094
UARTDR
UARTRSR/UARTECR
UARTFR
UARTILPR
UARTIBRD
UARTFBRD
UARTLCRH
UARTCTL
UARTIFLS
UARTIM
UARTRIS
UARTMIS
UARTICR
UARTDMACTL
UARTLCTL
UARTLSS
R/W
R/W
RO
R/W
R/W
R/W
R/W
R/W
R/W
R/W
RO
RO
W1C
R/W
R/W
RO
Reset
0x0000.0000
0x0000.0000
0x0000.0090
0x0000.0000
0x0000.0000
0x0000.0000
0x0000.0000
0x0000.0300
0x0000.0012
0x0000.0000
0x0000.000F
0x0000.0000
0x0000.0000
0x0000.0000
0x0000.0000
0x0000.0000
Description
UART Data
UART Receive Status/Error Clear
UART Flag
UART IrDA Low-Power Register
UART Integer Baud-Rate Divisor
UART Fractional Baud-Rate Divisor
UART Line Control
UART Control
UART Interrupt FIFO Level Select
UART Interrupt Mask
UART Raw Interrupt Status
UART Masked Interrupt Status
UART Interrupt Clear
UART DMA Control
UART LIN Control
UART LIN Snap Shot
See
page
618
620
623
626
627
628
629
631
635
637
641
645
648
650
651
652
616
June 14, 2010
Texas Instruments-Advance Information