參數資料
型號: 16F872
廠商: Microchip Technology Inc.
英文描述: CAT 5E CROSSOVER PATCH CORD CABLE GREEN 10 FT
中文描述: 28引腳,8位閃存微控制器的CMOS
文件頁數: 80/160頁
文件大?。?/td> 2600K
代理商: 16F872
PIC16F872
DS30221A-page 80
Preliminary
1999 Microchip Technology Inc.
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
T
BRG
T
BRG
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 T
BRG
T
BRG
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
Timeout
Set SSPIF
’0’
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