ATA5279 ATMEL Corporation, ATA5279 Datasheet - Page 21

• Manufacturer Part Number: ATA5279
• Manufacturer: ATMEL Corporation

3.9.2
9125A–RKE–04/08
General Command Description
The following commands are directly processed by the control logic, i.e., they are not fed into the
data buffer:
Table 3-4.
Refer to
Command
Get status info
Get driver setup
Get fault info
Reset fault status
Set SPI config
Halt operation
• Get Status Info:
• Get Driver Setup:
• Get Fault Info:
This command delivers the general IC status information back to the microcontroller (via the
SPI bus). One part of the return word is the interrupt request source. If such a request is
active (i.e., the IRQ line is high), the source for it is coded here. Possible sources include the
diagnosis block to indicate a driver stage fault (bit F), a general reset (either triggered
externally by the NRES pin or internally by the power-on reset structure, bit R), an
overtemperature of the chip (bit T) or the FIFO buffer to indicate that the fill state drops to
25% or below (i.e., only 4 words are left, bit BU) or the fill state exceeds the upper limit of 16
bytes (bit BO). The IRQ signal is reset with this command.
Additionally, the operability flag of the IC (bit Op) is returned in the word. Note that only if no
fault is stored in the fault register and all operation voltages are present and valid, the
operability is given (indicated by a 1 in the Op bit). Otherwise, ATA5279 will not process any
driver-related command.
Finally, the LF speed mode bit is returned here that indicates the current speed state of the
modulator stage (bit S, 0 for normal speed, 1 for high speed).
This command returns the actual setup of the driver stage, i.e., the selected coil, encoded in
the bits D
“Select Driver” and “Set Coil Current” command description below for details on bit coding).
This command is also used in diagnosis mode to fetch the state of the coil connection lines.
This command returns the content of the driver stage fault register back to the microcontroller
via the SPI bus. The register contains both the code for the detected fault and the number of
the driver stage that was active when the fault occurred. Refer also to the
“Status Monitor” on page 25
Section 3.7 “SPI” on page 14
G
,D
Bit Definitions of the General SPI Commands
1..0
, and the selected current, which can be found in the bits C
X
X
X
0
0
0
0
0
0
X
X
X
6
1
1
1
1
1
1
Input Word (MOSI Data)
for further details.
X
X
X
5
1
1
1
0
0
0
X
X
X
4
0
0
1
0
0
1
for bit direction definitions.
3
0
X
1
X
0
X
0
1
0
X
X
X
2
0
0
0
0
0
0
PO PH
X
X
X
1
0
0
0
0
0
ATA5279 [Preliminary]
0
X
0
X
0
X
0
0
D
C
X
R
X
X
X
X
X
G
4
C
D
Output Word (MISO Data)
X
F
X
X
X
X
X
6
3
1
BO
C
D
X
X
X
X
X
X
5
2
0
BU
C
X
X
X
X
X
X
4
T
1
Section 3.9.4
4..0
F
C
X
T
X
X
X
X
X
3
03
0
(see also
F
D
X
S
X
X
X
X
X
2
02
G
F
Op
D
X
X
X
X
X
X
1
01
1
F
D
X
X
X
X
X
X
X
21
00
0