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AK9752AE Datasheet(PDF) 12 Page - Asahi Kasei Microsystems |
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AK9752AE Datasheet(HTML) 12 Page - Asahi Kasei Microsystems |
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12 / 36 page  [AK9752] 016016473-E-00 2017/1 - 12 - 10.5. Read Measurement Data When measurement data is stored and updated in the read-out register, DRDY bit of ST1 register changes to “1”. This state is called “Data Ready”. It can be also set up so that INTN outputs “L”, when the DRDY changes to “1”, by setting the interrupt setting register INTEN. By the either above ways, it can be confirmed whether Data Ready or not. The read-out procedure is detailed as follows. (Single shot Mode is used as an example.) 10.5.1. Normal Read-out Procedure (1) Read out ST1 register DRDY: DRDY bit shows whether the state is “Data Ready” or not. DRDY = “0” means “No Data Ready”. DRDY = “1” means “Data Ready”. It is recommended that measurement data is read out when DRDY = “1”. (2) Read out INTCAUSE register Interrupt factors can be found out by reading out INTCAUSE register. Refer to 13. Registers Functional Descriptions for details. When starting reading-out of INTCAUSE register, measurement data are transferred to read-out registers and retained. (Data protection) INTN returns to “Hi-Z” after reading out INTCAUSE register. (3) Read out measurement data (4) Read out ST2 resister (Required Operation) AK9752 recognizes that a data read-out has finished by read out the ST2 registers. Because read-out registers are protected while reading out, data is not updated. Data protection of the read-out registers is released by reading out the ST2 register. The ST2 register must be read out after accessing read-out registers. DOR: DOR bit shows whether there are any data which had not been read out before initiating the current read. DOR= “0” means that there are no data which had not been read out before initiating the current read. DOR= “1” means that there are data which had not been read out before initiating the current read. DRDY and DOR changes to “0” after reading out ST2 register. Figure 10.4. Normal Read-out Procedure (N) th (N+1) th (N+2) th Measurement Meas. PD (Power down) Meas. PD Meas. PD Internal Buffer (N-1)th data (N)th data (N+1)th data (N+2)th data Read-out Register (N-1)th data (N)th data (N+1)th data (N+2)th data DRDY(ST1) DOR(ST2) INTN output SDA output ST1 INTC (N)th data ST2 ST1 INTC (N+1)th data ST2 * INTC = INTCAUSE DRDY changes to "0" because Read-out Register is not updated at read-out completion. |
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