參數(shù)資料
型號(hào): SC16C754BIBM
廠商: NXP Semiconductors N.V.
元件分類: 收發(fā)器
英文描述: 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit-s (max.) with 64-byte FIFOs
封裝: SC16C754BIA68<SOT188-2 (PLCC68)|<<http://www.nxp.com/packages/SOT188-2.html<1<Always Pb-free,;SC16C754BIA68<SOT188-2 (PLCC68)|<<http://www.nxp.com/packages/SOT188-2.html&
文件頁(yè)數(shù): 30/51頁(yè)
文件大?。?/td> 253K
代理商: SC16C754BIBM
SC16C754B_4
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 04 — 6 October 2008
30 of 51
NXP Semiconductors
SC16C754B
5 V, 3.3 V and 2.5 V quad 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 17
shows interrupt identification register bit settings.
The interrupt priority list is shown in
Table 18
.
Table 17.
Bit
7:6
5
4
3:1
0
Interrupt identification register bits description
Symbol
Description
IIR[7:6]
Mirror the contents of FCR[0].
IIR[5]
RTS/CTS LOW-to-HIGH change of state.
IIR[4]
1 = Xoff/special character has been detected.
IIR[3:1]
3-bit encoded interrupt. See
Table 18
.
IIR[0]
Interrupt status.
logic 0 = an interrupt is pending
logic 1 = no interrupt is pending
Table 18.
Priority
level
1
2
2
3
4
5
Interrupt priority list
IIR[5]
IIR[4]
IIR[3]
IIR[2]
IIR[1]
IIR[0]
Source of the interrupt
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
0
0
0
1
1
1
0
0
0
1
0
0
1
0
0
0
0
0
0
0
0
Receiver line status error
Receiver time-out interrupt
RHR interrupt
THR interrupt
Modem interrupt
Received Xoff signal/
special character
CTS, RTS change of state from
active (LOW) to inactive (HIGH)
6
1
0
0
0
0
0
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