MC68HC912DG128A MOTOROLA [Motorola, Inc], MC68HC912DG128A Datasheet - Page 267
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MC68HC912DG128A
Manufacturer Part Number
MC68HC912DG128A
Description
microcontroller unit 16BIT DEVICE
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC912DG128A.pdf
(404 pages)
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Arbitration Lost
21-iicbus
MOTOROLA
an ’end of data’ signal from the master receiver, after which it must be
switched from transmitter mode to receiver mode by software. A dummy
read then releases the SCL line so that the master can generate a STOP
signal.
If several masters try to engage the bus simultaneously, only one master
wins and the others lose arbitration. The devices which lost arbitration
are immediately switched to slave receive mode by the hardware. Their
data output to the SDA line is stopped, but SCL is still generated until the
end of the byte during which arbitration was lost. An interrupt occurs at
the falling edge of the ninth clock of this transfer with IBAL=1 and MS/
SL=0. If one master attempts to start transmission while the bus is being
engaged by another master, the hardware will inhibit the transmission;
switch the MS/SL bit from 1 to 0 without generating STOP condition;
generate an interrupt to CPU and set the IBAL to indicate that the
attempt to engage the bus is failed. When considering these cases, the
slave service routine should test the IBAL first and the software should
clear the IBAL bit if it is set.
Inter-IC Bus
MC68HC912DT128A Rev 2.0
IIC Programming Examples
Inter-IC Bus
267
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