Texas Instruments TMS320 2833 Series User Manual

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SPRUI07–March 2020
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Serial Peripheral Interface (SPI)
9.5.2.10 SPIFFRX Register (Offset = Bh) [reset = 201Fh]
SPIFFRX is shown in Figure 9-17 and described in Table 9-16.
Return to the Summary Table.
SPIFFRX contains both control and status bits related to the input FIFO buffer. This includes FIFO reset
control, FIFO interrupt level control, FIFO level status, as well as FIFO interrupt enable and clear bits.
Figure 9-17. SPIFFRX Register
15 14 13 12 11 10 9 8
RXFFOVF RXFFOVFCLR RXFIFORESET RXFFST
R-0h W-0h R/W-1h R-0h
7 6 5 4 3 2 1 0
RXFFINT RXFFINTCLR RXFFIENA RXFFIL
R-0h W-0h R/W-0h R/W-1Fh
Table 9-16. SPIFFRX Register Field Descriptions
Bit Field Type Reset Description
15 RXFFOVF R 0h
Receive FIFO Overflow Flag
Reset type: SYSRSn
0h (R/W) = Receive FIFO has not overflowed. This is a read-only
bit.
1h (R/W) = Receive FIFO has overflowed, read-only bit. More than
16 words have been received in to the FIFO, and the first received
word is lost.
14 RXFFOVFCLR W 0h
Receive FIFO Overflow Clear
Reset type: SYSRSn
0h (R/W) = Write 0 does not affect RXFFOVF flag bit, Bit reads
back a zero.
1h (R/W) = Write 1 to clear SPIFFRX[RXFFOVF].
13 RXFIFORESET R/W 1h
Receive FIFO Reset
Reset type: SYSRSn
0h (R/W) = Write 0 to reset the FIFO pointer to zero, and hold in
reset.
1h (R/W) = Re-enable receive FIFO operation.
12-8 RXFFST R 0h
Receive FIFO Status
Reset type: SYSRSn
0h (R/W) = Receive FIFO is empty.
1h (R/W) = Receive FIFO has 1 word.
2h (R/W) = Receive FIFO has 2 words.
10h (R/W) = Receive FIFO has 16 words, which is the maximum.
1Fh (R/W) = Reserved.
7 RXFFINT R 0h
Receive FIFO Interrupt Flag
Reset type: SYSRSn
0h (R/W) = RXFIFO interrupt has not occurred. This is a read-only
bit.
1h (R/W) = RXFIFO interrupt has occurred. This is a read-only bit.
6 RXFFINTCLR W 0h
Receive FIFO Interrupt Clear
Reset type: SYSRSn
0h (R/W) = Write 0 has no effect on RXFIFINT flag bit, Bit reads
back a zero.
1h (R/W) = Write 1 to clear SPIFFRX[RXFFINT] flag

Texas Instruments TMS320 2833 Series Specifications

General

Brand	Texas Instruments
Model	TMS320 2833 Series
Category	Controller
Language	English