PIC16F87X
9.2.18 MULTI -MASTER COMMUNICATION, BUS
COLLISION, AND BUS ARBITRATION
If a START, Repeated Start, STOP or Acknowledge
condition was in progress when the bus collision
occurred, the condition is aborted, the SDA and SCL
lines are deasserted, and the respective control bits in
the SSPCON2 register are cleared. When the user
services the bus collision interrupt service routine, and
if the I2C bus is free, the user can resume communica-
tion by asserting a START condition.
Multi-Master mode support is achieved by bus arbitra-
tion. When the master outputs address/data bits onto
the SDA pin, arbitration takes place when the master
outputs a ’1’ on SDA by letting SDA float high and
another master asserts a ’0’. When the SCL pin floats
high, data should be stable. If the expected data on
SDA is a ’1’ and the data sampled on the SDA pin = ’0’,
a bus collision has TACKEN place. The master will set
the Bus Collision Interrupt Flag, BCLIF and reset the
I2C port to its IDLE state. (Figure 9-19).
The Master will continue to monitor the SDA and SCL
pins, and if a STOP condition occurs, the SSPIF bit will
be set.
A write to the SSPBUF will start the transmission of
data at the first data bit, regardless of where the trans-
mitter left off when the bus collision occurred.
If a transmit was in progress when the bus collision
occurred, the transmission is halted, the BF flag is
cleared, the SDA and SCL lines are deasserted, and
the SSPBUF can be written to. When the user services
the bus collision interrupt service routine, and if the I2C
bus is free, the user can resume communication by
asserting a START condition.
In multi-master mode, the interrupt generation on the
detection of start and stop conditions allows the deter-
mination of when the bus is free. Control of the I2C bus
can be TACKEN when the P bit is set in the SSPSTAT
register, or the bus is idle and the S and P bits are
cleared.
FIGURE 9-19: BUS COLLISION TIMING FOR TRANSMIT AND ACKNOWLEDGE
Sample SDA. While SCL is high,
data doesn’t match what is driven
by the master.
SDA line pulled low
by another source
Data changes
while SCL = 0
Bus collision has occurred.
SDA released
by master
SDA
SCL
Set bus collision
interrupt.
BCLIF
DS30292A-page 88
1999 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
