- External reset pull-up resistor value for Freescale QY2 mcu
- Posted by Luisfr15 on April 13th, 2005
Hello,
wich is the correct resistor value for external pull-up reset pin ?
I put 10k but seems not be enought, CyclonePro doesn't *see* the mcu, if I
put 1K resistor it's ok ...
(voltage on reset pin is about 3,6V with 1K value, few millivolts with 10K)
I saw in AN2503 they used 47K pull-up value, maybe have I to connect
CyclonePro reset pin to mcu pin ?
Thanks for any help.
Luigi
- Posted by Gary Schnabl on April 13th, 2005
"Luisfr15" <nospam@please.com> wrote in message
news:HGg7e.1230679$35.45068208@news4.tin.it...
AN2640 also uses 47K for this.
- Posted by Luisfr15 on April 14th, 2005
"Gary Schnabl" <gschnabl@LivernoisYards.com> ha scritto nel messaggio
news:6dWdnUaPZf9EM8DfRVn-iA@comcast.com...
Oops, yes yes, my very big mistake or lack of memory ...
I forgot I'm supplying 5V from CyclonePro directly to mcu but
Reset pin of mcu is connected to voltage regulator (L4949) RST pin and
probably this is why it's at low state.
Bye
- Connecting to external monitor reset display (Help and Support) by Aidaca
- Can someone external reset my Autorun on a WinXP machine? (Computer Security) by Edw. Peach
- pull-up/pull-down/short-protection resistor design (Microprocessors) by Johnson Liuis
- Using a small 8-bit micro (LPC900) as external reset / watchdog device!? (Microprocessors) by An Schwob in USA
- Freescale (formerly Motorola) (Microprocessors) by WaldemarIII

