This is my first post on this forum and i hope someone will be kind enough to help me.
There are a lot of queries of mine pertaining to the MSP430F1101A
First what is the start up time for the 32768 crystal. My measured startup times vary from 400 - 700 ms?. Is there any way to reduce the startup time. Do i need to add an external 12pf cap.Will making my board with a complete ground plane be any advantage ?
The datasheet specifies the test pin to be left open. I have been advised though that the test pin should be pulled up. What should i do?
Also my circuit does not ever need to be reset after power on and i dont require a reset button. is it ok if i achieve an RC delay by connecting the reset pin to Vcc or is the RC delay not required at all.
Startup time can be long for those crystals.
The capacitors are built-in, but you need to make sure that your crystal has the correctr load capacitance. You also need the correct initialisation code.
A ground plane probably won’t help, but would be useful for controlling unwanted emissions.
The 'F1101A doesn’t need a pull-up on TEST, I think the 1101 did. It does need R and C on the RESET pin, IIRC. Both questions are in the User Guide.
Leon
thanks for the reply. all the suggestions were helpful but what do u mean by the load capacitance should be right ? thank you
solosynergy:
thanks for the reply. all the suggestions were helpful but what do u mean by the load capacitance should be right ? thank you
The load capacitance quoted by the crystal manufacturer (usually 6 or 12 pF). The MSP430 requires 6 pF crystals, IIRC.
Leon