http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. Thu, 04 Dec 2008 16:49:55 -0800 http://backend.userland.com/rss092 HiIm actually designing a Switch Mode Power Supply circuit. I then would like to apply a digital control at the feedback loop using an AVR.This is to <noauthor@nospam.com> http://www.8051projects.net/forum-t8692.html tiny avr will do the job.. why to use a development board when you can use a smaller controller and make a clean and simple stand alone board. Ajay<contact@nospam.com> http://www.8051projects.net/forum-t8692.html Oh really..Cos before this I thot using ATmega169 is much easier as it already comes in a package with its Butterfly board.Been stucked with this Butt nuRuL<ashleybelle9802@nospam.com> http://www.8051projects.net/forum-t8692.html To gain access to the PF4:PF7 as ADC you need to disble JTAG.This is done by disabling the JTAGEN fuse bit.Programming fuse bits is possible only thro sashijoseph<sashijoseph@nospam.com> http://www.8051projects.net/forum-t8692.html What do u mean by even with the JTAG enabled I could still use that 4 ADC channels? How do I do that?Plus do I actually need JTAG for my butterfly? Wh nuRuL<ashleybelle9802@nospam.com> http://www.8051projects.net/forum-t8692.html See out of the 8 PortF pins only 4 are used for JTAG(ie PF4:PF7).The rest PF0-PF3 can be used as normal I/O pins or as ADC pins.JTAG can be used for p sashijoseph<sashijoseph@nospam.com> http://www.8051projects.net/forum-t8692.html PWM works in background.. well you can do this way... when compare occurs interrupt is generated and whenever interrupt occurs change state of pin.. Ajay<contact@nospam.com> http://www.8051projects.net/forum-t8692.html manythanks for those infoive one more questionsay i have done my coding for PWM on timer/counter0the output should be on OCR0 which is PB4 (according nuRuL<ashleybelle9802@nospam.com> http://www.8051projects.net/forum-t8692.html