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FDC37C669_07 参数 Datasheet PDF下载

FDC37C669_07图片预览
型号: FDC37C669_07
PDF下载: 下载PDF文件 查看货源
内容描述: 98/99 PC兼容的超级I / O软盘控制器,红外支持 [PC 98/99 Compliant Super I/O Floppy Disk Controller with Infrared Support]
分类和应用: 控制器PC
文件页数/大小: 164 页 / 575 K
品牌: SMSC [ SMSC CORPORATION ]
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DESCRIPTION OF PIN FUNCTIONS  
BUFFER  
QFP/  
TQFP  
PIN NO.  
TYPE  
NAME  
SYMBOL  
DESCRIPTION  
84,86 nRing Indicator  
nRI1  
I
Active low Ring Indicator inputs for the  
serial port. Handshake signal which notifies  
the UART that the telephone ring signal is  
detected by the modem. The CPU can  
monitor the status of nRI signal by reading  
nRI2  
bit 6 of Modem Status Register (MSR).  
A
nRI signal state change from low to high  
after the last MSR read will set MSR bit 2 to  
a 1. If bit 3 of Interrupt Enable Register is  
set, the interrupt is generated when nRI  
changes state. Note: Bit 6 of MSR is the  
complement of nRI.  
PARALLEL PORT INTERFACE  
73  
74  
76  
nPrinter Select  
Input  
nSLCTIN  
OD24  
This active low output selects the printer.  
This is the complement of bit 3 of the Printer  
Control Register.  
Refer to Parallel Port description for use of  
this pin in ECP and EPP mode.  
0P24  
nInitiate Output  
nINIT  
OD24  
This output is bit 2 of the printer control  
register. This is used to initiate the printer  
when low.  
Refer to Parallel Port description for use of  
this pin in ECP and EPP mode.  
0P24  
nAutofeed  
Output  
nAUTOFD  
OD24  
This output goes low to cause the printer to  
automatically feed one line after each line is  
printed.  
The nAUTOFD output is the  
complement of bit 1 of the Printer Control  
Register.  
Refer to Parallel Port description for use of  
this pin in ECP and EPP mode.  
0P24  
11