PIC18F-LF1XK50 MICROCHIP [Microchip Technology], PIC18F-LF1XK50 Datasheet - Page 169

• Manufacturer Part Number: PIC18F-LF1XK50
• Description: 20-Pin USB Flash Microcontrollers
• Manufacturer: MICROCHIP [Microchip Technology]

15.3.8
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
SSPADD<6:0> and starts its count. If SCL and SDA are
both sampled high when the Baud Rate Generator
times out (T
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 Gener-
ator is reloaded with the contents of SSPADD<7:0>
and resumes its count. When the Baud Rate Generator
times out (T
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 15-19:
 2010 Microchip Technology Inc.
BRG
I
CONDITION TIMING
BRG
2
is
C MASTER MODE START
), the SEN bit of the SSPCON2 register
), the SDA pin is driven low. The action
reloaded
Write to SEN bit occurs here
FIRST START BIT TIMING
with
SDA
SCL
the
contents
SDA = 1,
SCL = 1
T
BRG
Preliminary
of
Set S bit (SSPSTAT<3>)
T
S
BRG
At completion of Start bit,
hardware clears SEN bit
15.3.8.1
If the user writes the SSPBUF when a Start sequence
is in progress, the WCOL is set and the contents of the
buffer are unchanged (the write doesn’t occur).
and sets SSPIF bit
Note:
Note:
T
Write to SSPBUF occurs here
BRG
PIC18F/LF1XK50
1st bit
If at the beginning of the Start condition,
the SDA and SCL pins are already sam-
pled 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 I
state.
Because queueing of events is not
allowed, writing to the lower 5 bits of
SSPCON2 is disabled until the Start
condition is complete.
WCOL Status Flag
T
BRG
2
C module is reset into its Idle
2nd bit
DS41350E-page 169