參數(shù)資料
型號: SC16C754BIA68,512
廠商: NXP Semiconductors
文件頁數(shù): 24/50頁
文件大小: 0K
描述: IC UART QUAD 64BYTE 68PLCC
標準包裝: 18
通道數(shù): 4,QUART
FIFO's: 64 字節(jié)
電源電壓: 2.5V,3.3V,5V
帶自動流量控制功能:
帶故障啟動位檢測功能:
帶調制解調器控制功能:
安裝類型: 表面貼裝
封裝/外殼: 68-LCC(J 形引線)
供應商設備封裝: 68-PLCC
包裝: 管件
其它名稱: 935274938512
SC16C754BIA68
SC16C754BIA68-ND
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 Identication 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 identication register bit settings.
The interrupt priority list is shown in Table 18.
Table 17.
Interrupt identication 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 18.
0
IIR[0]
Interrupt status.
logic 0 = an interrupt is pending
logic 1 = no interrupt is pending
Table 18.
Interrupt priority list
Priority
level
IIR[5]
IIR[4]
IIR[3]
IIR[2]
IIR[1]
IIR[0]
Source of the interrupt
1
0
1
0
Receiver line status error
2
0
1
0
Receiver time-out interrupt
2
0
1
0
RHR interrupt
3
0
1
0
THR interrupt
4
0
Modem interrupt
5
0
1
0
Received Xoff signal/
special character
6
1
00000
CTS, RTS change of state from
active (LOW) to inactive (HIGH)
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