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47N350 参数 Datasheet PDF下载

47N350图片预览
型号: 47N350
PDF下载: 下载PDF文件 查看货源
内容描述: LEGACY免费的键盘嵌入式控制器, SPI和LPC接口对接 [LEGACY FREE KEYBOARD EMBEDDED CONTROLLER WITH SPI AND LPC DOCKING INTERFACE]
分类和应用: 控制器PC
文件页数/大小: 346 页 / 4406 K
品牌: SMSC [ SMSC CORPORATION ]
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Legacy-Free Keyboard/Embedded Controller with SPI and LPC Docking Interface  
Note 29.7 8051 firmware responds to interrupt and latches data line before rising edge of PS2_CLK  
line.  
Note 29.8 8051 firmware clears Interrupt by reading the 8051 INT0 Source Register.  
29.8  
Serial Peripheral Interface (SPI) Timings  
29.8.1 SPI Clock Timing  
Tr  
Tf  
SPCLK  
Th  
Tl  
Tp  
Figure 29.17 SPI Clock Timing  
Table 29.6 SPI Clock Timing Parameters  
NAME  
DESCRIPTION  
MIN  
TYP  
MAX  
UNITS  
Tr  
SPI Clock Rise Time.  
10% of  
ns  
Measured from 10% to 90%.  
SPCLK  
Period  
Tf  
Th/Tl  
Tp  
SPI Clock Fall Time. Measured  
from 90% to 10%.  
10% of  
SPCLK  
Period  
SPI Clock High Time/SPI Clock  
Low Time  
40% of  
50% of SPCLK  
60% of  
SPCLK  
Period  
Period (See Note) SPCLK  
Period  
SPI Clock Period – As selected  
by SPIBR register.  
83.33  
31948.88  
Note: If divide by 1 is used on the ring oscillator, the duty cycle may not be 50%. The actual duty cycle  
of divide by 1 will be provided after characterization.  
SMSC LPC47N350  
301  
Revision 1.1 (01-14-03)  
DATASHEET  
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