參數(shù)資料
型號: MC68HC05JB3DW
廠商: FREESCALE SEMICONDUCTOR 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
文件頁數(shù): 132/148頁
文件大小: 1600K
代理商: MC68HC05JB3DW
GENERAL RELEASE SPECIFICATION
November 5, 1998
MOTOROLA
UNIVERSAL SERIAL BUS MODULE
MC68HC05JB3
10-16
REV 1
10.4.4.2 Bit Stufng
In order to ensure adequate signal transitions, bit stufng 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 stufng is enabled beginning with
the Sync Pattern and throughout the entire transmission. The data “one” that ends
the Sync Pattern is counted as the rst one in a sequence. Bit stufng is always
enforced, without exception. If required by the bit stufng 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 Stufng
IDLE
NRZI
ENCODED
DATA
BIT
STUFFED
DATA
RAW
DATA
STUFFED BIT
SYNC PATTERN
PACKET DATA
SYNC PATTERN
PACKET DATA
SYNC PATTERN
SIX ONES
相關(guān)PDF資料
PDF描述
MC68HC05JB3JDW 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDSO28
MC68HC05JB3JP 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDIP20
MC68HC05K3CSD 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDSO20
MC68HC05K3P 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDIP16
MC68HC05L25PB 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP52
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC05JJ6 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:General Release Specification Microcontrollers
MC68HC05JJ6CDW 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:General Release Specification Microcontrollers
MC68HC05JJ6CDWE 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:General Release Specification Microcontrollers
MC68HC05JJ6CP 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:General Release Specification Microcontrollers
MC68HC05JJ6CPE 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:General Release Specification Microcontrollers