SPELTER
Junior Member level 2
Hi,
I am building a mmc card reader using the code and circuit provided at http://elm-chan.org/fsw/ff/00index_e.html in the samples section(avr)
I am using a ATmega128L and 3.38 V as power supply for both the mmc card and the atmega128l.
My doubt is that in the circuit given on the site they have used a switching regulator(as far as i can figure it out) to provide the power to mmc,so can i completely eliminate it since i am using 3.38 v for both the card n uC?
Secondly a mmc has 7 pins and the sd card has 9 pins but in the circuit 11 connections are given for the card.What are they for and can the remaining four connections be neglected(as we are using the mmc card)
lastly as we are connecting our board to pc terminal using brays terminal random characters with a regular pattern are displayed as soon as we connect the board.So what could be the possible reason for that
I am attaching the schematic i am using which is same as the one given at the site except that i have used an additional component i.e. max3232 for level conversion
I am building a mmc card reader using the code and circuit provided at http://elm-chan.org/fsw/ff/00index_e.html in the samples section(avr)
I am using a ATmega128L and 3.38 V as power supply for both the mmc card and the atmega128l.
My doubt is that in the circuit given on the site they have used a switching regulator(as far as i can figure it out) to provide the power to mmc,so can i completely eliminate it since i am using 3.38 v for both the card n uC?
Secondly a mmc has 7 pins and the sd card has 9 pins but in the circuit 11 connections are given for the card.What are they for and can the remaining four connections be neglected(as we are using the mmc card)
lastly as we are connecting our board to pc terminal using brays terminal random characters with a regular pattern are displayed as soon as we connect the board.So what could be the possible reason for that
I am attaching the schematic i am using which is same as the one given at the site except that i have used an additional component i.e. max3232 for level conversion