Datasheet
19
BIG
AVR
6 Development System
MikroElektronika
page
15.0. MMC/SD Connector
The MMC/SD connector is used to enable memory cards to be interfaced to the microcontroller. To enable communication between
memory card and microcontroller, it is necessary to adjust their voltage levels. Memory card is powered by the 3.3V power supply
voltage (VCC-MMC) generated by the REG1 voltage regulator, whereas the value of the microcontroller power supply voltage is 5V
(VCC). The 74LVCC3245 bus transceiver is used here to adjust these voltage levels. In addition, communication between memory
card and microcontroller can be established only if switches 3, 4, 5, 6 and 7 on the DIP switch SW15 are set to the ON position.
)LJXUH: MMC/SD memory card
)LJXUH: MMC/SD connector and microcontroller connection schematic
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)LJXUH: MMC/SD connector