Preliminary
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Registers
19.3.9 FIFO Control Register (FCR)
The FIFO Control Register (FCR) is shown in
and described in
.
Figure 19-36. FIFO Control Register (FCR)
15
8
Reserved
R-0
7
6
5
4
3
2
1
0
RX_FIFO_TRIG
TX_FIFO_TRIG
DMA_MODE
TX_FIFO_CLEAR
RX_FIFO_CLEAR
FIFO_EN
W-0
W-0
W-0
W-0
W-0
W-0
LEGEND: R = Read only; W = Write only; -n = value after reset
Table 19-18. FIFO Control Register (FCR) Field Descriptions
Bit
Field
Value
Description
15-8
Reserved
0
Reserved.
7-6
RX_FIFO_TRIG
0-3h
Sets the trigger level for the RX FIFO:
If SCR[7] = 0 and TLR[7:4]
≠
0000, RX_FIFO_TRIG is not considered.
If SCR[7] = 1, RX_FIFO_TRIG is 2 LSB of the trigger level (1 to 63 on 6 bits) with the granularity 1.
If SCR[7] = 0 and TLR[7:4] = 0000:
0
8 characters
1h
16 characters
2h
56 characters
3h
60 characters
5-4
TX_FIFO_TRIG
0-3h
Can be written only if EFR[4] = 1.
Sets the trigger level for the TX FIFO:
If SCR[6] = 0 and TLR[3:0]
≠
0000, TX_FIFO_TRIG is not considered.
If SCR[6] = 1, TX_FIFO_TRIG is 2 LSB of the trigger level (1 to 63 on 6 bits) with a granularity of 1.
If SCR[6] = 0 and TLR[3:0] = 0000:
0
8 characters
1h
16 characters
2h
32 characters
3h
56 characters
3
DMA_MODE
Can be changed only when the baud clock is not running (DLL and DLH cleared to 0).
If SCR[0] = 0, this register is considered.
0
DMA_MODE 0 (No DMA).
1
DMA_MODE 1 (UART_NDMA_REQ[0] in TX, UART_NDMA_REQ[1] in RX).
2
TX_FIFO_CLEAR
0
No change.
1
Clears the transmit FIFO and resets its counter logic to 0. Returns to 0 after clearing FIFO.
1
RX_FIFO_CLEAR
0
No change.
1
Clears the receive FIFO and resets its counter logic to 0. Returns to 0 after clearing FIFO.
0
FIFO_EN
Can be changed only when the baud clock is not running (DLL and DLH cleared to 0).
0
Disables the transmit and receive FIFOs. The transmit and receive holding registers are 1-byte
FIFOs.
1
Enables the transmit and receive FIFOs. The transmit and receive holding registers are 64-byte
FIFOs.
1721
SPRUGX9 – 15 April 2011
UART/IrDA/CIR Module
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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