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68HC705JB3 bảng dữ liệu(PDF) 84 Page - Freescale Semiconductor, Inc

tên linh kiện 68HC705JB3
Giải thích chi tiết về linh kiện  8-bit microcontroller units (MCUs)
PDF  134 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

68HC705JB3 bảng dữ liệu(HTML) 84 Page - Freescale Semiconductor, Inc

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GENERAL RELEASE SPECIFICATION
November 5, 1998
MOTOROLA
UNIVERSAL SERIAL BUS MODULE
MC68HC05JB3
10-16
REV 1
10.4.4.2 Bit Stuffing
In order to ensure adequate signal transitions, bit stuffing is employed by the
transmitting device when sending a packet on the USB (see Figure 10-18 and
Figure 10-19). A 0 is inserted after every six consecutive 1’s in the data stream
before the data is NRZI encoded to force a transition in the NRZI data stream.
This gives the receiver logic a data transition at least once every seven bit times to
guarantee the data and clock lock. The receiver must decode the NRZI data,
recognize the stuffed bits, and discard them. Bit stuffing is enabled beginning with
the Sync Pattern and throughout the entire transmission. The data “one” that ends
the Sync Pattern is counted as the first one in a sequence. Bit stuffing is always
enforced, without exception. If required by the bit stuffing rules, a zero bit will be
inserted even if it is the last bit before the end-of-packet (EOP) signal.
Figure 10-18. Bit Stuffing
IDLE
NRZI
ENCODED
DATA
BIT
STUFFED
DATA
RAW
DATA
STUFFED BIT
SYNC PATTERN
PACKET DATA
PACKET DATA
SYNC PATTERN
PACKET DATA
SYNC PATTERN
SIX ONES
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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