AT90S2313 | AT90S8515 | ATMega | ATmega128 | ECL | FETS | IAR | Keyboard | LCD | STK50 | TMOS | UART

hey folks

i have been working on recording voice on MMC using ATmega 16
controller... I am using MMC in SPI mode, and i m not using any buffer
for the data.. as soon as i get the sample i send it to the mmc .. if
in case the page is full and the update in the page's address needs to
be done.. that change is done.. and the process keeps going on like
this... but during the time the voice is getting recorded( data being
transferred) the ground levels in the whole ckt dont remain the same,,
specially the ground near the MMC moves such that if i put an earphone
in between mmc ground and the card ground i can actually hear a sound
similar to a helicpter's sound .. this sound gets added up to the
voice that is recorded and hence... the quality becomes poor.. i havnt
been able to figure out the reason.. can u please help!!!
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