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SC68C752B bảng dữ liệu(PDF) 14 Page - NXP Semiconductors

tên linh kiện SC68C752B
Giải thích chi tiết về linh kiện  5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 64-byte FIFOs and 68 mode 關P interface
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nhà sản xuất  NXP [NXP Semiconductors]
Trang chủ  http://www.nxp.com
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SC68C752B bảng dữ liệu(HTML) 14 Page - NXP Semiconductors

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SC68C752B_4
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 04 — 20 January 2010
14 of 48
NXP Semiconductors
SC68C752B
5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 64-byte FIFOs
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, 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.
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 9 shows FIFO
polled mode operation.
Fig 8.
Interrupt mode operation
11
11
IIR
IER
THR
RHR
PROCESSOR
R/W
IRQ
002aab096
Fig 9.
FIFO polled mode operation
00
00
IIR
IER
THR
RHR
PROCESSOR
R/W
002aab097



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