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SP37E760 参数 Datasheet PDF下载

SP37E760图片预览
型号: SP37E760
PDF下载: 下载PDF文件 查看货源
内容描述: 3.3 V的I / O控制器的嵌入式应用 [3.3 V I/O CONTROLLER FOR EMBEDDED APPLICATIONS]
分类和应用: 控制器
文件页数/大小: 78 页 / 507 K
品牌: SMSC [ SMSC CORPORATION ]
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Table 5 - Interrupt Control  
INTERRUPT SET AND RESET FUNCTIONS  
FIFO  
MODE  
ONLY  
INTERRUPT  
IDENTIFICATION  
REGISTER  
BIT  
3
BIT  
BIT  
BIT  
0
PRIORITY  
LEVEL  
INTERRUPT  
TYPE  
INTERRUPT  
SOURCE  
INTERRUPT  
2
1
RESET CONTROL  
0
0
0
1
0
1
1
0
-
None  
None  
-
Highest  
Receiver Line Overrun Error, Reading the Line  
Status  
Parity Error,  
Framing Error  
or Break  
Status Register  
Interrupt  
0
1
1
1
0
0
0
0
Second  
Second  
Received  
Data  
Receiver Data Read Receiver  
Available  
Buffer or the FIFO  
drops below the  
trigger level.  
Available  
Character  
Time-out  
Indication  
No Characters Reading the  
Have Been  
Removed  
Receiver Buffer  
Register  
From or Input  
to the RCVR  
FIFO during  
the last 4  
Character  
times and there  
is at least 1  
character in it  
during this time  
0
0
0
0
1
0
0
0
Third  
Transmitter  
Holding  
Transmitter  
Reading the IIR  
Holding  
Register (if Source  
Register  
Empty  
Register Empty of Interrupt) or  
Writing the  
Transmitter Holding  
Register  
Fourth  
MODEM  
Status  
Clear to Send  
or Data Set  
Reading the  
MODEM Status  
Ready or Ring Register  
Indicator or  
Data Carrier  
Detect  
4.1.5 FIFO CONTROL REGISTER (FCR)  
The FIFO Control register (Address Offset = 2H, DLAB = X, WRITE) appears at the same location as the IIR. This  
register is used to enable and clear the FIFOs and set the RCVR FIFO trigger level. Note: DMA is not supported.  
4.1.5.1  
FIFO Enable, Bit 0  
Setting the FIFO Enable bit to a logic “1” enables both the XMIT and RCVR FIFOs. Clearing this bit to a logic “0”  
disables both the XMIT and RCVR FIFOs and clears all bytes from both FIFOs. When changing from FIFO Mode to  
non-FIFO (16450) mode, data is automatically cleared from the FIFOs. This bit must be a 1 when other bits in this  
register are written to or they will not be properly programmed.  
4.1.5.2  
RCVR FIFO Reset, Bit 1  
Setting the RCVR FIFO Reset bit to a logic “1” clears all bytes in the RCVR FIFO and resets its counter logic  
to 0. The shift register is not cleared. This bit is self-clearing.  
4.1.5.3  
XMIT FIFO Reset, Bit 2  
Setting the XMIT FIFO Reset bit to a logic “1” clears all bytes in the XMIT FIFO and resets its counter logic to 0. The  
shift register is not cleared. This bit is self-clearing.  
SMSC DS – SP37E760  
Page 17  
Rev. 04/13/2001  
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