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Part Number: MSP430G2553
I am having trouble figuring out this problem. Maybe someone here can give me some ideas. I am using the TI MSP430 Launchpad.
I have fixed the MSP430G2553 clock speed at 8 MHz in the code, and according to the datasheet, the clock speed should increase with increasing voltage. However, when I measure it using DCO calibration technique, I get a decreasing clock speed with increasing voltage. The variation is not too much; it varies between 7.92 to 8.16MHz. But shouldn't it be fixed at 8MHz, or maybe increase? I see nothing in the datasheet that explains this anomaly.
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In reply to Clemens Ladisch:
In reply to Abu Bakar:
This figure shows allowed frequencies. For example, when VCC is 2.7 V, then you must not use any frequency higher than 12 MHz.
If I read the information on page 30 of the MSP430G2553 data sheet correctly, that actually falls into the specification for power supply rejection error of the DCO at +/-3% from 2.2 to 3.6V
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