AK09916C Datasheet, PDF (12/29 Pages) Asahi Kasei Microsystems – 3-axis Electronic Compass

[AK09916]
9.4.3.3. Data Read Start during Measurement
When sensor is measuring (Measurement period), measurement data registers (HXL to TMPS) keep the
previous data. Therefore, it is possible to read out data even in measurement period. If data is started to be
read during measurement period, previous data is read.
(N-1)th Nth
(N+1)th
PD Measurement
PD
Measurement
PD
Measurement Data Register
(N-1)th
Nth
DRDY
Data read
ST1 Data(N)
ST2
ST1 Data(N)
ST2
Figure 9.6. Data read start during measurement
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
Measurement Data Register
(N-1)th
Nth
(N+1)th
DRDY
DOR
Data read
ST1 Data(N+1) ST2
Figure 9.7. Data Skip: When data is not read
015007392-E-02
- 12 -
2015/12