sc16c654 NXP Semiconductors, sc16c654 Datasheet - Page 32

• Manufacturer Part Number: sc16c654
• Description: Quad Uart With 64-byte Fifo And Infrared Irda Encoder/decoder
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 11617
Product data
Table 22:
Table 23:
[1]
Bit
5
4
3-0
Cont-3
0
1
0
1
X
X
X
1
0
1
When using software flow control the Xon/Xoff characters cannot be used for data transfer.
Symbol
EFR[5]
EFR[4]
EFR[3-0]
Cont-2
0
0
1
1
X
X
X
0
1
1
Enhanced Feature Register bits description
Software flow control functions
Quad UART with 64-byte FIFO and infrared (IrDA) encoder/decoder
Cont-1
X
X
X
X
0
1
0
1
1
1
Rev. 04 — 19 June 2003
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 SC16C654/654D enhanced functions.
Cont-3-0 Tx, Rx control. Logic 0 or cleared is the default condition.
Combinations of software flow control can be selected by programming
these bits. See
Logic 0 = Special character detect disabled (normal default condition).
Logic 1 = Special character detect enabled. The SC16C654/654D
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 (normal default condition).
Logic 1 = Enable.
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
23.
[1]
SC16C654/654D
…continued
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
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