MCIMX233CJM4B Datasheet, PDF (1154/1612 Pages) Freescale Semiconductor, Inc – i.MX23 Applications Processor Reference Manual

Application UART
is, the design is such that the interrupts are generated when the fill level progresses through the trigger
level. The bits are reset so that the trigger level is when the FIFOs are at the half-way mark.
EXAMPLE:
No Example.
26.4.4 UART Line Control Register Description
The UART Line Control Register contains integer and fractional part of the baud rate divisor value. It also
contains the line control bits.
HW_UARTAPP_LINECTRL
HW_UARTAPP_LINECTRL_SET
HW_UARTAPP_LINECTRL_CLR
HW_UARTAPP_LINECTRL_TOG
0x030
0x034
0x038
0x03C
Table 26-8. HW_UARTAPP_LINECTRL
33222222222211111111110000000000
10987654321098765432109876543210
Table 26-9. HW_UARTAPP_LINECTRL Bit Field Descriptions
BITS
LABEL
31:16 BAUD_DIVINT
15:14 RSVD
13:8 BAUD_DIVFRAC
7
SPS
6:5 WLEN
4
FEN
3
STP2
RW RESET
RW 0x0
RO 0x0
RW 0x0
RW 0x0
RW 0x0
RW 0x0
RW 0x0
DEFINITION
Baud Rate Integer [15:0]. The integer baud rate divisor.
Reserved, do not modify, read as zero.
Baud Rate Fraction [5:0]. The fractional baud rate
divisor.
Stick Parity Select. When bits 1, 2, and 7 of this
register are set, the parity bit is transmitted and
checked as a 0. When bits 1 and 7 are set, and bit 2 is
0, the parity bit is transmitted and checked as a 1.
When this bit is cleared stick parity is disabled.
Word length [1:0]. The select bits indicate the number
of data bits transmitted or received in a frame as
follows: 11 = 8 bits, 10 = 7 bits, 01 = 6 bits, 00 = 5 bits.
Enable FIFOs. If this bit is set to 1, transmit and
receive FIFO buffers are enabled (FIFO mode). When
cleared to 0, the FIFOs are disabled (character mode);
that is, the FIFOs become 1-byte-deep holding
registers.
Two Stop Bits Select. If this bit is set to 1, two stop bits
are transmitted at the end of the frame. The receive
logic does not check for two stop bits being received.
26-10
i.MX23 Applications Processor Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor