mc68hc705v12 Freescale Semiconductor, Inc, mc68hc705v12 Datasheet - Page 199

• Manufacturer Part Number: mc68hc705v12
• Description: M68hc05-based Mcu Hc05 Freescale Semiconductor
• Manufacturer: Freescale Semiconductor, Inc

15.7 Coil Sequencer and Control
15.7.1 Scanning Sequence Description
15.7.1.1 Automatic Mode
MC68HC705V12
—
Rev. 3.0
As shown in
all 12 coils. The sequence in which the coils are scanned and the events
that take place during the scanning process are described in this section.
The scan control and status register in
Register
contains control bits that affect how the gauge sequencer will scan
through the six gauges as well as a status bit to indicate where the
scanning sequencer is in the scanning operation.
The coil sequencer can be operated in two basic modes: automatic or
manual. In either mode, each coil is updated by the D/A, muxes, and
sample and hold circuits in the sequence shown in
time through the coil sequence is referred to as a scan cycle. It takes a
time, t
there are 12 coils in the six gauge drivers, it will take a time, 12 * t
to complete one scan cycle.
The differences between the automatic and manual modes are
discussed in the following subsections.
Once all of the coils have been updated, the sequence repeats
automatically. The transfer of data in the CMR and CDRs
master-to-slave buffers is performed at the beginning of each gauge
update time.
When one of the coil registers associated with a gauge is written, the
second register also must be written before either value will be used.
The coil registers may be written in either order.
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GCS,
controls how the coil sequencer will operate. This register
to update each coil during the scanning sequence. Since
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Figure
Gauge Drivers
15-1, the digital/analog converter is shared among
15.7.2 Scan Status and Control
Coil Sequencer and Control
Figure
Advance Information
15-1. One
Gauge Drivers
GCS,