SC16C2550 datasheet(21/46 Pages) PHILIPS

Part #	SC16C2550

Description	Dual UART with 16 bytes of transmit and receive FIFOs and infrared (IrDA) encoder/decoder

PDF	46 Pages

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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21 / 46 page

Philips Semiconductors

SC16C2550

Dual UART with 16 bytes of transmit and receive FIFOs and IrDA

encoder/decoder

Product data

Rev. 03 — 19 June 2003

21 of 46

9397 750 11621

7.4 Interrupt Status Register (ISR)

The SC16C2550 provides four levels of prioritized interrupts to minimize external

software interaction. The Interrupt Status Register (ISR) provides the user with four

interrupt status bits. Performing a read cycle on the ISR will provide the user with the

highest pending interrupt level to be serviced. No other interrupts are acknowledged

until the pending interrupt is serviced. A lower level interrupt may be seen after

servicing the higher level interrupt and re-reading the interrupt status bits. Table 11

“Interrupt source” shows the data values (bits 0-3) for the four prioritized interrupt

levels and the interrupt sources associated with each of these interrupt levels.

1

FCR[1]

RCVR FIFO reset.

Logic 0 = Receive FIFO not reset (normal default condition).

Logic 1 = Clears the contents of the receive FIFO and resets the

FIFO counter logic (the receive shift register is not cleared or

altered). This bit will return to a logic 0 after clearing the FIFO.

0

FCR[0]

FIFOs enabled.

Logic 0 = Disable the transmit and receive FIFO (normal default

condition).

Logic 1 = Enable the transmit and receive FIFO. This bit must

be a ‘1’ when other FCR bits are written to, or they will not

be programmed.

Table 10:

RCVR trigger levels

FCR[7]

FCR[6]

RX FIFO trigger level

0001

0104

1008

1114

Table 9:

FIFO Control Register bits description…continued

Bit

Symbol

Description

Table 11:

Interrupt source

Priority

level

ISR[5]

ISR[4]

ISR[3]

ISR[2]

ISR[1]

ISR[0]

Source of the interrupt

1

0

00110LSR (Receiver Line Status

Register)

2

0

00100

RXRDY (Received Data

Ready)

2

0

01100

RXRDY (Receive Data

time-out)

3

0

00010

TXRDY (Transmitter

Holding Register Empty)

4

0

00000

MSR (Modem Status

Register)

5

0

10000

RXRDY (Received Xoff

signal) / Special character

6

1

00000CTS, RTS change of state

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