Datasheet

SCI/LIN Control Registers www.ti.com
28.7.11 SCI Format Control Register (SCIFORMAT)
Figure 28-38 and Table 28-23 illustrate this register.
Figure 28-38. SCI Format Control Register (SCIFORMAT) (offset = 28h)
31 19 18 16
Reserved LENGTH
R-0 R/W-0
15 3 2 0
Reserved CHAR
R-0 R/WC-0
LEGEND: R/W = Read/Write; R = Read only; WC = Write in SCI-compatible mode only; -n = value after reset
Table 28-23. SCI Format Control Register (SCIFORMAT) Field Descriptions
Bit Field Value Description
31-19 Reserved 0 Read returns 0. Writes have no effect.
18-16 LENGTH 0-3h Frame length control bits. In LIN mode, these bits indicate the number of bytes in the response
field from 1 to 8 bytes. In buffered SCI mode, these bits indicate the number of characters, with the
number of bits per character specified in CHAR (SCIFORMAT[2:0]).
When these bits are used to indicate LIN response length (SCIGCR1[0] = 1), then when there is
an ID RX match, this value should be updated with the expected length of the response. In
buffered SCI mode, these bits indicate the transmitter/receiver format for the number of characters:
1 to 8. There can be up to eight characters with eight bits each.
0 The response field has 1 byte/character.
1h The response field has 2 bytes/characters.
2h The response field has 3 bytes/characters.
3h The response field has 4 bytes/characters.
4h The response field has 5 bytes/characters.
5h The response field has 6 bytes/characters.
6h The response field has 7 bytes/characters.
7h The response field has 8 bytes/characters.
15-3 Reserved 0 Read returns 0. Writes have no effect.
2-0 CHAR 0-7h Character length control bits. These bits are effective in non-buffered SCI and buffered SCI modes
only. These bits set the SCI character length from 1 to 8 bits.
In non-buffered SCI and buffered SCI mode, when data of fewer than eight bits in length is
received, it is left justified in SCIRD/RDy and padded with trailing zeros. Data read from the
SCIRD should be shifted by software to make the received data right justified.
Data written to the SCITD should be right justified but does not need to be padded with
leading zeros.
0 The character is 1 bit long.
1h The character is 2 bits long.
2h The character is 3 bits long.
3h The character is 4 bits long.
4h The character is 5 bits long.
5h The character is 6 bits long.
6h The character is 7 bits long.
7h The character is 8 bits long.
1416
Serial Communication Interface (SCI)/Local Interconnect Network (LIN) SPNU562–May 2014
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