Part Number: MSP-FET430UIF
Tool/software: Code Composer Studio
I have question concerning the recommended connection of the /RST/NMI input of the MSP430FR5728. Refering page 40 of SLAU272C there is a pullup resistor of 47K to Vcc and a pull-down capacitor in the range of 10 nF downto 2.2 nF recommended. We are using in our design a combination of 47K to Vcc and 2.2 nF to Ground. On some boards the 2-wire JTAG communication runs and other boards it does not run. The MSP430 Hardware User Guide (SLAU278AE) recommend under conditions which are refering to some EVMs a capacitior of 1.1nF. If the JTAG is not connected this capacitor determines the RESET timing of the MSP. A variation of the capacitor in range from 1.1nF upto 10nF infuences the time constant by a factor of 10.
What is the recommended value for this capacitor?
Thanks in advance for a quick answer.