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For waves mentioned in "slaa639_LC Sensor Rotation Detection With MSP430™ Extended Scan" as below:
We think, channel 3 should be ACLK and channel 2 measures the LC sensor signal. But seems no clearly description about what signal on Channel1.
Would you please help tell what signal shown on channel 1? Via any pin we can obsearve this signal with scope?
Channel 1 in Figure 10 appears to be capturing the TSM (timing state machine) clock signal.
After analyzing the initial settings of the TSM registers shown in Section 4.5 in SLAA639, Point 2 in Figure 10 shows 5 cycles of the TSM clock sourced from the high frequency clock source. At Point 3, the TSM clock is sourced by the low frequency clock, ACLK.
To observe this signal on a scope, you can utilize the ESITEST4 pin by selecting the TSM clock signal with the ESITEST4SEL bits in the ESIPSM register. Please see Section 31.3.16 and Figure 31-13 (shown below) in the User's Guide.
Please let me know if you have any more questions.
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In reply to James Evans:
In reply to Mehmet Alper USLU:
As you can see in Figure 37-2 in the User's Guide, the 8-bit MSB portion of the DAC output is connected to the ESITEST1 pin. Looking at the datasheet for the MSP430FR6989, this corresponds to P9.1.
The TSM will need to be configured to make sure the internal DAC of the ESI module is always on, but this is possible. I've attached some sample code which should allow you to monitor the voltage on P9.1. For the configuration in the sample code, the voltage increases approximately every second.
Hopefully this helps.
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