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鍙冩暩(sh霉)璩囨枡
鍨嬭櫉锛� PIC16F1513T-I/SS
寤犲晢锛� Microchip Technology
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PIC16(L)F1512/3
DS41624B-page 216
Preliminary
2012 Microchip Technology Inc.
20.6.4
I2C MASTER MODE START
CONDITION TIMING
To initiate a Start condition, the user sets the Start
Enable bit, SEN bit of the SSPCON2 register. If the
SDA and SCL pins are sampled high, the Baud Rate
Generator
is
reloaded
with
the
contents
of
SSPADD<7:0> and starts its count. If SCL and SDA
are both sampled high when the Baud Rate Generator
times out (TBRG), the SDA pin is driven low. The action
of the SDA being driven low while SCL is high is the
Start condition and causes the S bit of the SSPSTAT1
register to be set. Following this, the Baud Rate
Generator
is
reloaded
with
the
contents
of
SSPADD<7:0> and resumes its count. When the Baud
Rate Generator times out (TBRG), the SEN bit of the
SSPCON2 register will be automatically cleared by
hardware; the Baud Rate Generator is suspended,
leaving the SDA line held low and the Start condition is
complete.
FIGURE 20-26:
FIRST START BIT TIMING
Note 1:
If at the beginning of the Start condition,
the SDA and SCL pins are already
sampled low, or if during the Start
condition, the SCL line is sampled low
before the SDA line is driven low, a bus
collision
occurs,
the
Bus
Collision
Interrupt Flag, BCLIF, is set, the Start
condition is aborted and the I2C module is
reset into its Idle state.
2:
The Philips I2C Specification states that a
bus collision cannot occur on a Start.
SDA
SCL
S
TBRG
1st bit
2nd bit
TBRG
SDA = 1,
At completion of Start bit,
SCL = 1
Write to SSPBUF occurs here
TBRG
hardware clears SEN bit
TBRG
Write to SEN bit occurs here
Set S bit (SSPSTAT<3>)
and sets SSPIF bit
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