PIC18C658 MICROCHIP [Microchip Technology], PIC18C658 Datasheet - Page 162

• Manufacturer Part Number: PIC18C658
• Description: High-Performance Microcontrollers with CAN Module
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18CXX8
15.4.15 MULTI-MASTER MODE
In Multi-master mode, the interrupt generation on the
detection of the START and STOP conditions allows
the determination of when the bus is free. The STOP
(P) and START (S) bits are cleared from a RESET, or
when the MSSP module is disabled. Control of the I
bus may be taken when the P bit (SSPSTAT register) is
set, or the bus is idle with both the S and P bits clear.
When the bus is busy, enabling the SSP Interrupt will
generate the interrupt when the STOP condition
occurs.
In Multi-master operation, the SDA line must be moni-
tored for arbitration, to see if the signal level is the
expected output level. This check is performed in hard-
ware, with the result placed in the BCLIF bit.
Arbitration can be lost in the following states:
• Address transfer
• Data transfer
• A START condition
• A Repeated START condition
• An Acknowledge condition
FIGURE 15-20: BUS COLLISION TIMING FOR TRANSMIT AND ACKNOWLEDGE
DS30475A-page 162
SDA
SCL
BCLIF
Data changes
while SCL = 0
Advanced Information
SDA released
by master
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SDA line pulled low
by another source
15.4.16 MULTI -MASTER COMMUNICATION, BUS
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',
then a bus collision has taken place. The master will set
the Bus Collision Interrupt Flag (BCLIF) and reset the
I
If a transmit was in progress when the bus collision
occurred, the transmission is halted, the BF bit is
cleared, the SDA and SCL lines are de-asserted, and
the SSPBUF can be written to. When the user services
the bus collision interrupt service routine, and if the I
bus is free, the user can resume communication by
asserting a START condition.
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 de-asserted, and the respective control bits in
the SSPCON2 register are cleared. When the user ser-
vices the bus collision interrupt service routine, and if
the I
by asserting a START condition.
The master will continue to monitor the SDA and SCL
pins. 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.
In Multi-master mode, the interrupt generation on the
detection of START and STOP conditions allows the
determination of when the bus is free. Control of the I
bus can be taken when the P bit is set in the SSPSTAT
register, or the bus is idle and the S and P bits are
cleared.
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C port to its IDLE state. (Figure 15-20).
2
C bus is free, the user can resume communication
COLLISION, AND BUS ARBITRATION
Sample SDA. While SCL is high
data doesn’t match what is driven
by the master.
Bus collision has occurred.
Set bus collision
interrupt (BCLIF)
 2000 Microchip Technology Inc.
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