MC68HC05V12 Datasheet, PDF (190/246 Pages) Freescale Semiconductor, Inc – HCMOS Microcontreller Unit

Gauge Drivers
Freescale Semiconductor, Inc.
Addr.
Register Name
Bit 7
6
5
4
3
2
Read:
$0029
MINB2 Magnitude Register
(MINB2)
Write:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Reset: 0
0
0
0
0
0
Read:
$002A
MINC1 Magnitude Register
(MINC1)
Write:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Reset: 0
0
0
0
0
0
Read:
$002B
MINC2 Magnitude Register
(MINC2)
Write:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Reset: 0
0
0
0
0
0
Read:
$002C
MIND1 Magnitude Register
(MIND1)
Write:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Reset: 0
0
0
0
0
0
Read:
$002D
MIND2 Magnitude Register
(MIND2)
Write:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Reset: 0
0
0
0
0
0
Figure 15-6. Current Magnitude Registers (Continued)
1
Bit 0
Bit 1 Bit 0
0
0
Bit 1 Bit 0
0
0
Bit 1 Bit 0
0
0
Bit 1 Bit 0
0
0
Bit 1 Bit 0
0
0
The naming convention used in the CMRs in Figure 15-6 indicates
whether it is a major or minor gauge driver, which major or minor gauge
(A, B, C, etc.), and which coil within the gauge is affected (coil 1 or coil 2).
Each of the magnitude registers is double buffered to keep both coil
currents within the same gauge as closely coupled as possible. Transfer
of data from the master to the slave buffers in these registers is under
control of the coil sequencer and control logic and is described in 15.7
Coil Sequencer and Control. A read of any of the CMRs will return only
the contents of the slave buffer. If a read of one of the CMRs takes place
after a write of data but before the master-to-slave transfer takes place,
the data read may be different from the data written. The master register
will always hold the contents of the last write. Reset clears all bits.
The 8-bit value written to these registers will determine the amount of
current that will flow in each of the 12 coils. For example, MAJA1 controls
the magnitude of the current between the MAJA1+ and MAJA1− pins.
Technical Data
Gauge Drivers
For More Information On This Product,
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MC68HC05V12 — Rev. 2.0