SB16C1058-TQFP128 IK Semicon Co., Ltd, SB16C1058-TQFP128 Datasheet - Page 21

• Manufacturer Part Number: SB16C1058-TQFP128
• Description: Octal-uart Controller With 256-byte Fifo
• Manufacturer: IK Semicon Co., Ltd

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Tips for using Xon/Xoff character as two characters are as follows.
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If characters are arrived continuously like Xon1, Xon2 or Xoff1, Xoff2, descriptions are as
follows.
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character.
If Xon and Xoff character are set to same, both characters are treated as Xon
character.
If received characters are Xon1, Xon1 and Xon2, RX flow control status becomes
XON and previous Xon1 is ignored.
If received characters are Xoff1, Xoff1 and Xoff2, RX flow control status becomes
XOFF and previous Xoff1 is ignored.
If received characters are repeated as Xon1 Xoff1, Xon1 and Xoff1, there is no effect
in RX flow control status and these characters are not treated as data. But if received
characters are Xon1 Xoff1, Xon1, Xoff1, Xon1 and Xon2, RX flow control status
becomes XON.
If received characters are Xon1 Xoff1, Xon1, Xoff1 and Xoff2, RX flow control status
becomes XOFF.
If Xon1 and Xoff1 characters do not precede Xon2 and Xoff2, Xon2 and Xoff2 are
treated as data and stored in RX FIFO.
If Xon1 is not accompanied with Xon2 or Xoff1 character, it is treated as data and
stored in RX FIFO.
If Xoff1 is not accompanied with Xoff2 or Xon1 character, it is treated as data and
stored in RX FIFO.
As seen before, if received characters are Xon1, Xoff2, Xon2 or Xoff1, Xon2, Xoff2,
these characters are all treated as data and stored in RX FIFO.
If Xon1, Xon2 characters and Xoff1, Xoff2 characters are same with each other, all
characters are treated as normal XON and XOFF characters.
If Xon1, Xoff1 characters and Xon2, Xoff2 characters are same with each other,
these are treated as normal XON characters.
If Xon1, Xon2, Xoff1 characters are same and Xoff2 is different, these are treated as
normal XON, XOFF characters.
If Xon1, Xon2, Xoff2 characters are same and Xoff1 is different, these are treated as
normal XON, XOFF characters.
If Xon2, Xoff1, Xoff2 characters are same and Xon1 is different, these are treated as
normal XON, XOFF characters.
If Xon1, Xoff1, Xoff2 characters are same and Xon2 is different, these are treated as
normal XON, XOFF characters.
If Xon2, Xoff1 characters are same and Xon1, Xoff2 are different, these are treated
as normal XON, XOFF characters.
If Xon1, Xon2, Xoff1, Xoff2 are all same, these are treated only as normal XON
characters.
In all these cases no XON/XOFF characters are treated as data.
Refer to Table 5 below.
OCTAL UART WITH 256-BYTE FIFO
IN16C1058
JUNE 2009
REV 1.0
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