參數(shù)資料
型號(hào): MC68HC05JB3JDW
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁(yè)數(shù): 121/148頁(yè)
文件大?。?/td> 1600K
代理商: MC68HC05JB3JDW
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GENERAL RELEASE SPECIFICATION
November 5, 1998
MOTOROLA
UNIVERSAL SERIAL BUS MODULE
MC68HC05JB3
10-6
REV 1
10.2.1.4 Endpoint Field (ENDP)
The Endpoint eld is a four bit number that is used to select a particular endpoint
within a USB device. For the MC68HC05JB3, this will be a binary number
between zero and two inclusive. Any other value will cause the transaction to be
ignored.
10.2.1.5 Cyclic Redundancy Check (CRC)
Cyclic Redundancy Checks are used to verify the address and data stream of a
USB transaction. This eld is ve bits wide for token packets and sixteen bits wide
for data packets. CRCs are generated in the transmitter and sent on the USB data
lines after both the endpoint eld and the data eld. Figure 10-6 shows how the
ve bit CRC value is calculated from the data stream and veried for the address
and endpoint elds of a token packet. Figure 10-7 shows how the sixteen bit CRC
value is calculated and either transmitted or veried for the data packet of a given
transaction.
Figure 10-6. CRC Block Diagram for Address and Endpoint Fields
00 1 0 1
01 1 0 0
0
5
next bit
Data Stream
Update every bit time
Reset to ones at SOP
Equal?
Good CRC
Bad CRC
5
YN
Expected Residual:
Generator Polynomial:
MUX
1
0
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