参数资料
型号: USB-100
厂商: Fujitsu Semiconductor America Inc
文件页数: 59/143页
文件大小: 0K
描述: KIT STARTER FOR USB
标准包装: 1
类型: MCU
适用于相关产品: MB91F662
所含物品: 板,线缆
产品目录页面: 722 (CN2011-ZH PDF)
相关产品: 865-1099-ND - IC MCU 512KB FLASH FR80 120-LQFP
其它名称: 865-1108
4.5
Transfer rate
USB transfer rates are standardized as shown below.
Table 4.5-1. USB Transfer rates
Low Speed
Full Speed
High Speed
USB 1.0/1.1
USB 2.0
1.5 Mbps
1.5 Mbps
12 Mbps
12 Mbps
-
480 Mbps
The MB91F662 supports only Full Speed.
4.6
Transfer rate detection
The USB standard requires that USB devices allow for the automatic detection of their data
transfer rate when connected to the host by using a pull-up resistor.
- A Full Speed device pulls up the D+ signal line with a 1.5 k ? (R2) resistor.
- A Full Speed device pulls up the D- signal line with a 1.5 k ? (R2) resistor.
(Transfer rate types will be discussed later.)
After the USB device is connected, the host detects whether it is the D+ signal line or D- signal
line that is pulled up, and selects its data transfer rate accordingly.
Additionally, cable lengths are standardized to a maximum of 5 meters for Full Speed rates, and
a maximum of 3 meters for Low Speed rates.
Figure 4.6-1 Differences in connection based on transfer rates
58
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USBMLCF USB BDM INTERFACE MC P&E
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