AK09918 Datasheet, PDF (13/30 Pages) Asahi Kasei Microsystems – 3-axis Electronic Compass

[AK09918]
9.4.3.4. Data Skip
When Nth data was not read before (N+1)th measurement ends, Data Ready remains until data is read. In
this case, a set of measurement data is skipped so that DOR bit turns to “1”.
When data reading started after Nth measurement ended and did not finish reading before (N+1)th
measurement ended, Nth measurement data is protected to keep correct data. In this case, a set of
measurement data is skipped and not stored so that DOR bit turns to “1”.
In both case, DOR bit turns to “0” at the next start of data reading.
(N-1)th Nth
(N+1)th
PD Measurement
PD
Measurement
PD
Internal Buffer
(N-1)th
Nth
(N+1)th
Measurement Data Register
(N-1)th
(N+1)th
DRDY
DOR
Data read
ST1 Data(N+1) ST2
Figure 9.7. Data Skip: When data is not read
(N-1)th Nth
(N+1)th
(N+2)th
PD Measurement
PD
Measurement
PD
Measurement
PD
Internal Buffer
(N-1)th
Nth
(N+1)th
(N+2)th
Measurement Data Register
(N-1)th
Nth
Data register is protected
because data is being read
(N+2)th
DRDY
DRDY changes to "1"
because read-out becomes possible.
DOR
(N+1)th data is skipped
Data read
ST1 Data(N)
ST2
ST1 Data(N+2)
Figure 9.8. Data Skip: When data read has not been finished before the next measurement end
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2016/11