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2011-2012 Microchip Technology Inc.
Preliminary
DS41579C-page 299
PIC16(L)F1782/3
26.6.5
I2
C MASTER MODE REPEATED
START CONDITION TIMING
A Repeated Start condition occurs when the RSEN bit
of the SSPCON2 register is programmed high and the
master state machine is no longer active. When the
RSEN bit is set, the SCL pin is asserted low. When the
SCL pin is sampled low, the Baud Rate Generator is
loaded and begins counting. The SDA pin is released
(brought high) for one Baud Rate Generator count
(TBRG). When the Baud Rate Generator times out, if
SDA is sampled high, the SCL pin will be deasserted
(brought high). When SCL is sampled high, the Baud
Rate Generator is reloaded and begins counting. SDA
and SCL must be sampled high for one TBRG. This
action is then followed by assertion of the SDA pin
(SDA = 0) for one TBRG while SCL is high. SCL is
asserted low. Following this, the RSEN bit of the
SSPCON2 register will be automatically cleared and
the Baud Rate Generator will not be reloaded, leaving
the SDA pin held low. As soon as a Start condition is
detected on the SDA and SCL pins, the S bit of the
SSPSTAT register will be set. The SSPIF bit will not be
set until the Baud Rate Generator has timed out.
FIGURE 26-27:
REPEAT START CONDITION WAVEFORM
Note 1:
If RSEN is programmed while any other
event is in progress, it will not take effect.
2:
A bus collision during the Repeated Start
condition occurs if:
SDA is sampled low when SCL
goes from low-to-high.
SCL goes low before SDA is
asserted low. This may indicate
that another master is attempting
to transmit a data 鈥�1鈥�.
SDA
SCL
Repeated Start
Write to SSPCON2
Write to SSPBUF occurs here
At completion of Start bit,
hardware clears RSEN bit
1st bit
S bit set by hardware
TBRG
SDA = 1,
SCL (no change)
SCL = 1
occurs here
TBRG
and sets SSPIF
Sr
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