SC16IS752IPW datasheet(15/59 Pages) NXP

Part #	SC16IS752IPW

Description	Dual UART with I2C-bus/SPI interface, 64 bytes of transmit and receive FIFOs, IrDA SIR built-in support

PDF	59 Pages

Scroll/Zoom	100%

Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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15 / 59 page

SC16IS752_SC16IS762_7

Product data sheet

Rev. 07 — 19 May 2008

15 of 59

NXP Semiconductors

SC16IS752/SC16IS762

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

7.5.1 Interrupt mode operation

In Interrupt mode (if any bit of IER[3:0] is 1) the host is informed of the status of the

receiver and transmitter by an interrupt signal, IRQ. Therefore, it is not necessary to

continuously poll the Line Status Register (LSR) to see if any interrupt needs to be

serviced. Figure 8 shows Interrupt mode operation.

7.5.2 Polled mode operation

In Polled mode (IER[3:0] = 0000) the status of the receiver and transmitter can be

checked by polling the Line Status Register (LSR). This mode is an alternative to the FIFO

Interrupt mode of operation where the status of the receiver and transmitter is

automatically known by means of interrupts sent to the CPU. Figure 9 shows FIFO Polled

mode operation.

Fig 8.

Interrupt mode operation

IIR

IER

THR

RHR

HOST

IRQ

002aab042

read IIR

Fig 9.

FIFO Polled mode operation

LSR

IER

THR

RHR

HOST

read LSR

002aab043

SC16IS752IPW Datasheet(PDF) 15 Page - NXP Semiconductors