SC16IS740_11 datasheet(30/63 Pages) NXP

Part #	SC16IS740

Description	Single UART with I2C-bus/SPI interface, 64 bytes of transmit and receive FIFOs

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Manufacturer	NXP [NXP Semiconductors]

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SC16IS740_750_760

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Product data sheet

Rev. 7 — 9 June 2011

30 of 63

NXP Semiconductors

SC16IS740/750/760

Single UART with I2C-bus/SPI interface, 64-byte FIFOs, IrDA SIR

8.10 Interrupt Identification Register (IIR)

The IIR is a read-only 8-bit register which provides the source of the interrupt in a

prioritized manner. Table 20 shows Interrupt Identification Register bit settings.

[1]

Modem interrupt status must be read via MSR register and GPIO interrupt status must be read via IOState

register.

[2]

Only available on SC16IS750/SC16IS760.

Table 20.

Interrupt Identification Register bits description

Bit

Symbol

Description

7:6

IIR[7:6]

mirror the contents of FCR[0]

5:1

IIR[5:1]

5-bit encoded interrupt. See Table 21.

0

IIR[0]

interrupt status

logic 0 = an interrupt is pending

logic 1 = no interrupt is pending

Table 21.

Interrupt source

Priority

level

IIR[5]

IIR[4]

IIR[3]

IIR[2]

IIR[1]

IIR[0]

Source of the interrupt

1

0

1

0

Receiver Line Status error

2

0

1

0

Receiver time-out interrupt

2

0

1

0

RHR interrupt

3

0

00

01

0THR interrupt

4

0

00

0modem interrupt[1][2]

5

1

0

input pin change of state[1][2]

6

0

1

0

received Xoff signal/

special character

7

1

00

0CTS, RTS change of state from

active (LOW) to inactive

(HIGH)

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