sc16is741ipw NXP Semiconductors, sc16is741ipw Datasheet - Page 12

• Manufacturer Part Number: sc16is741ipw
• Description: Single Uart With I2c-bus/spi Interface, 64 Bytes Of Transmit And Receive Fifos, Irda Sir Built-in Support
• Manufacturer: NXP Semiconductors

NXP Semiconductors
SC16IS741_1
Product data sheet
7.5.1 Interrupt mode operation
7.5.2 Polled 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.
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.
mode operation.
Fig 8.
Fig 9.
Interrupt mode operation
FIFO Polled mode operation
Figure 8
HOST
HOST
shows Interrupt mode operation.
Single UART with I
Rev. 01 — 29 April 2010
read LSR
read IIR
IRQ
2
C-bus/SPI interface, 64-byte FIFOs, IrDA SIR
THR
THR
LSR
IER
IER
IIR
Figure 9
1
0
1
0
SC16IS741
RHR
RHR
002aab043
1
002aab042
0
shows FIFO Polled
1
0
© NXP B.V. 2010. All rights reserved.
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