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SC68C752B датащи(PDF) 29 Page - NXP Semiconductors

номер детали SC68C752B
подробное описание детали  5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 64-byte FIFOs and Motorola uP interface
PDF  49 Pages
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

SC68C752B датащи(HTML) 29 Page - NXP Semiconductors

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SC68C752B_3
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 03 — 29 November 2005
29 of 49
Philips Semiconductors
SC68C752B
5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 64-byte FIFOs
7.9 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 18 shows Interrupt Identification Register bit settings.
The interrupt priority list is shown in Table 19.
Table 18:
Interrupt Identification Register bits description
Bit
Symbol
Description
7:6
IIR[7:6]
Mirror the contents of FCR[0].
5
IIR[5]
RTS/CTS LOW-to-HIGH change of state
4
IIR[4]
1 = Xoff/Special character has been detected
3:1
IIR[3:1]
3-bit encoded interrupt. See Table 19.
0
IIR[0]
Interrupt status.
logic 0 = an interrupt is pending
logic 1 = no interrupt is pending
Table 19:
Interrupt priority list
Priority
level
IIR[5]
IIR[4]
IIR[3]
IIR[2]
IIR[1]
IIR[0]
Source of the interrupt
1
000110
receiver line status error
2
001100
receiver time-out interrupt
2
000100
RHR interrupt
3
000010
THR interrupt
4
000000
modem interrupt
5
010000
received Xoff signal/ special
character
6
100000
CTS, RTS change of state from
active (LOW) to inactive (HIGH)



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