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SC16C752 데이터시트(PDF) 13 Page - NXP Semiconductors

부품명 SC16C752
상세설명  Dual UART with 64-byte FIFO
PDF  47 Pages
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제조업체  PHILIPS [NXP Semiconductors]
홈페이지  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

SC16C752 데이터시트(HTML) 13 Page - NXP Semiconductors

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Philips Semiconductors
SC16C752
Dual UART with 64-byte FIFO
Product data
Rev. 04 — 20 June 2003
13 of 47
9397 750 11635
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
6.5.1
Interrupt mode operation
In interrupt mode (if any bit of IER[3:0] is 1) the processor is informed of the status of
the receiver and transmitter by an interrupt signal, INT. Therefore, it is not necessary
to continuously poll the line status register (LSR) to see if any interrupt needs to be
serviced. Figure 7 shows interrupt mode operation.
6.5.2
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 8 shows FIFO
polled mode operation.
Fig 7.
Interrupt mode operation.
11
11
IIR
IER
THR
RHR
PROCESSOR
IOW / IOR
INT
002aaa230
Fig 8.
FIFO polled mode operation.
00
00
LSR
IER
THR
RHR
PROCESSOR
IOW / IOR
002aaa231



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