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MSC8113 Reference Manual, Rev. 0
21-10
Freescale Semiconductor
UART
21.1.3 Idle Characters
An idle character contains all logic 1s and has no start, stop, or parity bit. The length of idle
characters depends on the M bit in SCICR. The preamble is a synchronizing idle character that
begins the first transmission initiated after the SCICR[TE] bit is written from 0 to 1. Clearing and
then setting the SCICR[TE] bit during a transmission queues an idle character to be sent after the
frame currently being transmitted.
Note:
When queuing an idle character, return the SCICR[TE] bit to logic 1 before the stop bit
of the current frame shifts out to
UTXD
. Setting SCICR[TE] after the stop bit appears on
UTXD
discards data previously written to the SCI data register. Toggle the SCICR[TE]
bit for a queued idle character while the TDRE flag is set and immediately before
writing the next character to the SCI data register. See Figure 21-7, Queuing an Idle
Character.
21.1.4 Parity Bit Generation
The UART can be configured to enable parity bit generation by the parity enable bit
(SCICR[PE]). The parity type bit (SCICR[PT]) determines whether to place even or odd parity at
T8 (if M = 1) or at T7 (if M = 0) bits of SCIDR.
21.2 Receiver
The SCI receiver can accommodate either 8-bit or 9-bit data characters. The state of the
SCICR[M] bit determines the length of data characters. When receiving 9-bit data, bit R8 in the
SCIDR is the ninth bit (bit 8).
Figure 21-7. Queuing an Idle Character
Start
Bit
Stop
Bit
Start
Bit
Stop
Bit
Character
Next Data
Character
Idle
UTXD
Stop
Bit
TDRE flag
is set
Toggle
TE bit
Write next
data character
to SCIDR
Character
Current Data
Summary of Contents for MSC8113
Page 1: ...MSC8113 Reference Manual Tri Core 16 Bit Digital Signal Processor MSC8113RM Rev 0 May 2008 ...
Page 20: ...MSC8113 Reference Manual Rev 0 xx Freescale Semiconductor Contents ...
Page 28: ...MSC8113 Reference Manual Rev 0 xxviii Freescale Semiconductor ...
Page 56: ...MSC8113 Reference Manual Rev 0 1 28 Freescale Semiconductor MSC8113 Overview ...
Page 76: ...MSC8113 Reference Manual Rev 0 2 20 Freescale Semiconductor SC140 Core Overview ...
Page 134: ...MSC8113 Reference Manual Rev 0 4 30 Freescale Semiconductor System Interface Unit SIU ...
Page 168: ...MSC8113 Reference Manual Rev 0 6 18 Freescale Semiconductor Boot Program ...
Page 180: ...MSC8113 Reference Manual Rev 0 7 12 Freescale Semiconductor Clocks ...
Page 260: ...MSC8113 Reference Manual Rev 0 8 80 Freescale Semiconductor Memory Map ...
Page 300: ...MSC8113 Reference Manual Rev 0 9 40 Freescale Semiconductor Extended Core ...
Page 304: ...MSC8113 Reference Manual Rev 0 10 4 Freescale Semiconductor MQBus and M2 Memory ...
Page 308: ...MSC8113 Reference Manual Rev 0 11 4 Freescale Semiconductor SQBus ...
Page 590: ...MSC8113 Reference Manual Rev 0 17 46 Freescale Semiconductor Interrupt Processing ...
Page 614: ...MSC8113 Reference Manual Rev 0 18 24 Freescale Semiconductor Debugging ...
Page 622: ...MSC8113 Reference Manual Rev 0 19 8 Freescale Semiconductor Internal Peripheral Bus IPBus ...
Page 724: ...MSC8113 Reference Manual Rev 0 21 32 Freescale Semiconductor UART ...
Page 920: ...MSC8113 Reference Manual Rev 0 25 150 Freescale Semiconductor Ethernet Controller ...
Page 1171: ...MSC8113 Reference Manual Rev 0 Freescale Semiconductor C 61 EF wait_rts P 01077FFC 9F rts 71 ...
Page 1172: ...MSC8113 Reference Manual Rev 0 C 62 Freescale Semiconductor MSC8113 Boot Code ...
Page 1202: ...MSC8113 Reference Manual Rev 0 Index 30 Freescale Semiconductor Index ...