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UART Registers
19.5.1.44 Received Frame Length Low Register (RXFLL)
The received frame length low register (RXFLL) and the RXFLH register hold the 12-bit receive maximum
frame length. RXFLL holds the LSBs and RXFLH holds the MSBs. If the intended maximum receive frame
length is n bytes, program RXFLL and RXFLH to be n + 3 in SIR or MIR modes and n + 6 in FIR mode
(+3 and +6 are the result of frame format with CRC and stop flag; two bytes are associated with the FIR
stop flag). The received frame length low register (RXFLL) is shown in Figure 19-77 and described in
Table 19-76.
Figure 19-77. Received Frame Length Low Register (RXFLL)
15 8 7 0
Reserved RXFLL
R-0 W-0
LEGEND: R/W = Read/Write; W = Write only; -n = value after reset
Table 19-76. Received Frame Length Low Register (RXFLL) Field Descriptions
Bit Field Value Description
15-8 Reserved 0 Reserved.
7-0 RXFLL 0-FFh LSB register used to specify the frame length in reception.
19.5.1.45 Received Frame Length High Register (RXFLH)
The received frame length high register (RXFLH) and the RXFLL register hold the 12-bit receive maximum
frame length. RXFLL holds the LSBs and RXFLH holds the MSBs. If the intended maximum receive frame
length is n bytes, program RXFLL and RXFLH to be n + 3 in SIR or MIR modes and n + 6 in FIR mode
(+3 and +6 are the result of frame format with CRC and stop flag; two bytes are associated with the FIR
stop flag). The received frame length high register (RXFLH) is shown in Figure 19-78 and described in
Table 19-77.
Figure 19-78. Received Frame Length High Register (RXFLH)
15 4 3 0
Reserved RXFLH
R-0 W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 19-77. Received Frame Length High Register (RXFLH) Field Descriptions
Bit Field Value Description
15-4 Reserved 0 Reserved.
3-0 RXFLH 0-Fh MSB register used to specify the frame length in reception.
3541
SPRUH73H–October 2011–Revised April 2013 Universal Asynchronous Receiver/Transmitter (UART)
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