SC16C554 datasheet(34/55 Pages) PHILIPS

34 / 55 page

Philips Semiconductors

SC16C554/554D

Quad UART with 16-byte FIFO and infrared (IrDA) encoder/decoder

Product data

Rev. 05 — 10 May 2004

34 of 55

9397 750 13132

[1]

When using software ﬂow control the Xon/Xoff characters cannot be used for data transfer.

EFR[5]

Special Character Detect.

Logic 0 = Special character detect disabled (normal default condition).

Logic 1 = Special character detect enabled. The SC16C554/554D

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).

EFR[4]

Enhanced function control bit. The content of IER[7:4], ISR[5:4], and

MCR[6] 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 SC16C554/554D enhanced functions.

Logic 0 = Disable (normal default condition).

Logic 1 = Enable.

3:0

EFR[3:0]

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 Table 22.

Table 22:

Software ﬂow control functions[1]

Cont-3

Cont-2

Cont-1

Cont-0

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

Table 21:

Enhanced Feature Register bits description…continued

Bit

Symbol

Description

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