參數(shù)資料
型號: SC16C754B
廠商: NXP Semiconductors N.V.
英文描述: 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 64-byte FIFOs
中文描述: 5伏,3.3伏和2.5伏兆5四異步/秒(最大)64字節(jié)的FIFO
文件頁數(shù): 30/50頁
文件大?。?/td> 259K
代理商: SC16C754B
9397 750 14668
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 02 — 13 June 2005
30 of 50
Philips 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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