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MC912D60ACPVE8 Datasheet, PDF (292/460 Pages) Freescale Semiconductor, Inc – MC68HC912D60A MC68HC912D60C MC68HC912D60P Technical Data | |||
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Freescale Interconnect Bus
â0â
â1â
Biphase coded signal
t
01234567 01234567
Biphase detection
Noise detection
a
aâ a
b
bâ b
a
aâ a
b
bâ b
Figure 16-2. Biphase coding and error detection
16.5 Message validation
The communication between the MCU and the selected device is valid
when the MCU reads a pull data field having correct codes (excluding
the codes â111â and â000â) followed by a square wave signal, having a
frequency of 20kHz, contained in the end-of-frame information.
An MI Bus error is detected when the pull field contains the code â111â
followed by the end-of-frame permanently tied to logical state â1â. This
means that the communication between the MCU and the selected
device was not accomplished.
Technical Data
292
Freescale Interconnect Bus
MC68HC912D60A â Rev. 3.1
Freescale Semiconductor
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