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PIC16F877-04/P 数据表(PDF) 93 Page - Microchip Technology

部件名 PIC16F877-04/P
功能描述  28/40-pin 8-Bit CMOS FLASH Microcontrollers
PDF  218 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

PIC16F877-04/P 数据表(HTML) 93 Page - Microchip Technology

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 2001 Microchip Technology Inc.
DS30292C-page 91
PIC16F87X
FIGURE 9-21:
BUS COLLISION DURING START CONDITION (SCL = 0)
FIGURE 9-22:
BRG RESET DUE TO SDA COLLISION DURING START CONDITION
SDA
SCL
SEN
Bus collision occurs, Set BCLIF
SCL = 0 before SDA = 0,
Set SEN, enable START
sequence if SDA = 1, SCL = 1
TBRG
TBRG
SDA = 0, SCL = 1
BCLIF
S
SSPIF
Interrupts cleared
in software
Bus collision occurs, Set BCLIF
SCL = 0 before BRG time-out,
’0’
’0’
’0’
’0’
SDA
SCL
SEN
Set S
Set SEN, enable START
sequence if SDA = 1, SCL = 1
Less than TBRG
TBRG
SDA = 0, SCL = 1
BCLIF
S
SSPIF
s
Interrupts cleared
in software
Set SSPIF
SDA = 0, SCL = 1
SDA pulled low by other master.
Reset BRG and assert SDA.
SCL pulled low after BRG
Time-out
Set SSPIF
’0’



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