geezer 0 Posted February 4, 2016 Share Posted February 4, 2016 i am new to this depth of electrical application, i do know electrical fundamentals. i got a MSP430 and im trying to apply the "blink" example program to my breadboard with only the 430g2553 chip, not the launchpad, but i can not got the life of me get it to work. i have good 3VDC in to pin 1 and good ground going into pin11. i have a 47k ohm resistor coming out of pin 15 going to ground with a reset switch in between going straight to ground. and even with all that, i cannot get this 430g2553 chip to work on my breadboard. please help. Quote Link to post Share on other sites
dubnet 238 Posted February 4, 2016 Share Posted February 4, 2016 First of all, welcome to the forum. You didn't mention if you had a capacitor tied to the reset line. Please do a forum search using search terms capacitor and reset. This will give you the suggested value and the circuit configuration. geezer and energia 2 Quote Link to post Share on other sites
spirilis 1,265 Posted February 4, 2016 Share Posted February 4, 2016 Also a 0.1uF cap across Vcc/GND would be mandatory. Isn't GND pin#20? (level with Vcc just on the other side of the chip) geezer and energia 2 Quote Link to post Share on other sites
yosh 121 Posted February 4, 2016 Share Posted February 4, 2016 i have a 47k ohm resistor coming out of pin 15 going to ground ... The 47k reset (pull up) resistor need to be connected to VCC ... this pin (it's Pin 16!) tied to GND causes reset. Please check this: Pinout energia, geezer and reaper7 3 Quote Link to post Share on other sites
geezer 0 Posted February 5, 2016 Author Share Posted February 5, 2016 Also a 0.1uF cap across Vcc/GND would be mandatory. Isn't GND pin#20? (level with Vcc just on the other side of the chip) Thank you, this worked. Nothing i read seemed to say this was required. Quote Link to post Share on other sites
geezer 0 Posted February 5, 2016 Author Share Posted February 5, 2016 The 47k reset (pull up) resistor need to be connected to VCC ... this pin (it's Pin 16!) tied to GND causes reset. Please check this: Pinout Sorry, that was a mistake, what you said was how it was set up. Quote Link to post Share on other sites
geezer 0 Posted February 5, 2016 Author Share Posted February 5, 2016 First of all, welcome to the forum. You didn't mention if you had a capacitor tied to the reset line. Please do a forum search using search terms capacitor and reset. This will give you the suggested value and the circuit configuration. Thank you for the welcome and the advice. Quote Link to post Share on other sites
spirilis 1,265 Posted February 5, 2016 Share Posted February 5, 2016 Thank you, this worked. Nothing i read seemed to say this was required. Yep that's one of those "basic electronics" things I guess a lot of tutorials might forget... decoupling capacitors. 0.1uF is typically a good value for small low-power MCUs running under 16MHz or so. I believe the value (and quantity) changes from chip to chip... an 80MHz MCU might have a different set of ideal values and might require a large one in parallel (e.g. 4.7uF) if it's capable of drawing a lot of power. Quote Link to post Share on other sites
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