SCI Registers
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SPRUI07–March 2020
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Serial Communications Interface (SCI)
10.14.2.11 SCIFFRX Register (Offset = Bh) [reset = 201Fh]
SCIFFRX is shown in Figure 10-21 and described in Table 10-17.
Return to the Summary Table.
SCIFFTX controls the receive FIFO interrupt, receive FIFO reset, and status of the receive FIFO overflow.
Figure 10-21. SCIFFRX Register
15 14 13 12 11 10 9 8
RXFFOVF RXFFOVRCLR RXFIFORESET RXFFST
R-0h R-0/W1S-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 10-17. SCIFFRX Register Field Descriptions
Bit Field Type Reset Description
15 RXFFOVF R 0h
Receive FIFO overflow.
This will function as flag, but cannot generate interrupt by itself. This
condition will occur while receive interrupt is active. Receive
interrupts should service this flag condition.
Reset type: SYSRSn
0h (R/W) = Receive FIFO has not overflowed, 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 RXFFOVRCLR R-0/W1S 0h
RXFFOVF clear
Reset type: SYSRSn
0h (R/W) = Write 0 has no effect on RXFFOVF flag bit, Bit reads
back a zero
1h (R/W) = Write 1 to clear RXFFOVF flag in bit 15
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
FIFO status
Reset type: SYSRSn
0h (R/W) = Receive FIFO is empty
1h (R/W) = Receive FIFO has 1 words
2h (R/W) = Receive FIFO has 2 words
3h (R/W) = Receive FIFO has 3 words
4h (R/W) = Receive FIFO has 4 words
5h (R/W) = Receive FIFO has 5 words
6h (R/W) = Receive FIFO has 6 words
7h (R/W) = Receive FIFO has 7 words
8h (R/W) = Receive FIFO has 8 words
9h (R/W) = Receive FIFO has 9 words
Ah (R/W) = Receive FIFO has 10 words
Bh (R/W) = Receive FIFO has 11 words
Ch (R/W) = Receive FIFO has 12 words
Dh (R/W) = Receive FIFO has 13 words
Eh (R/W) = Receive FIFO has 14 words
Fh (R/W) = Receive FIFO has 15 words
10h (R/W) = Receive FIFO has 16 words
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