SC16C2550 Philips Semiconductors, SC16C2550 Datasheet - Page 28

• Manufacturer Part Number: SC16C2550
• Description: Dual UART with 16 bytes of transmit and receive FIFOs and infrared (IrDA) encoder/decoder
• Manufacturer: Philips Semiconductors

Philips Semiconductors
9397 750 11621
Product data
Table 20:
Table 21:
[1]
Bit
5
4
3-0
Cont-3
0
1
0
1
X
X
X
1
0
1
When using a software flow control the Xon/Xoff characters cannot be used for data transfer.
Symbol
EFR[5]
EFR[4]
EFR[3-0] Cont-3-0 Tx, Rx control. Logic 0 or cleared is the default condition.
Cont-2
0
0
1
1
X
X
X
0
1
1
Enhanced Feature Register bits description
Software flow control functions
Dual UART with 16 bytes of transmit and receive FIFOs and IrDA
Description
Special Character Detect.
Enhanced function control bit. The content of IER[7-4], ISR[5-4], FCR[5-4],
and MCR[7-5] can be modified and latched. After modifying any bits in the
enhanced registers, EFR[4] can be set to a logic 0 to latch the new values.
This feature prevents existing software from altering or overwriting the
SC16C2550 enhanced functions.
Combinations of software flow control can be selected by programming
these bits. See
Cont-1
X
X
X
X
0
1
0
1
1
1
Rev. 03 — 19 June 2003
Logic 0 = Special character detect disabled (normal default condition).
Logic 1 = Special character detect enabled. The SC16C2550 compares
each incoming receive character with Xoff2 data. If a match exists, the
received data will be transferred to FIFO and ISR[4] will be set to
indicate detection of special character. Bit-0 in the X-registers
corresponds with the LSB bit for the receive character. When this feature
is enabled, the normal software flow control must be disabled (EFR[3-0]
must be set to a logic 0).
Logic 0 = disable/latch enhanced features. IER[7-4], ISR[5-4], FCR[5-4],
and MCR[7-5] are saved to retain the user settings, then IER[7-4]
ISR[5-4], FCR[5-4], and MCR[7-5] are set to a logic 0 to be compatible
with SC16C554 mode. (Normal default condition.)
Logic 1 = Enables the enhanced functions. When this bit is set to a
logic 1, all enhanced features of the SC16C2550 are enabled and user
settings stored during a reset will be restored.
Cont-0
X
X
X
X
0
0
1
1
1
1
Table
TX, RX software flow controls
No transmit flow control
Transmit Xon1/Xoff1
Transmit Xon2/Xoff2
Transmit Xon1 and Xon2/Xoff1 and Xoff2
No receive flow control
Receiver compares Xon1/Xoff1
Receiver compares Xon2/Xoff2
Transmit Xon1/Xoff1
Receiver compares Xon1 and Xon2, Xoff1 and Xoff2
Transmit Xon2/Xoff2
Receiver compares Xon1 and Xon2/Xoff1 and Xoff2
Transmit Xon1 and Xon2/Xoff1 and Xoff2
Receiver compares Xon1 and Xon2/Xoff1 and Xoff2
21.
[1]
…continued
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
SC16C2550
encoder/decoder
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