maroq
PIC - MMC (Multi Media Card) Flash Memory Extension
This version utilizes a PIC16F876, but it's easy to port the schematic and software to other PIC's.
The MMC is connected to the SPI pins of the PIC via simple resistor voltage dividers to transform the +5V high levels to about 3.3V used by the MMC. The supply voltage for the MMC (2.7V - 3.6V) comes from a LD1086V33 voltage regulator (3.3V) or equivalent. It is possible to run the PIC at 3.3V, but then the AD converters are not as stable as at 5V. The data-out pin from the MMC goes directly to the PIC, because 3.3V is high for the PIC anyway... read more at: www.captain.at/electronics/pic-mmc/
PIC - MMC (Multi Media Card) Flash Memory Extension
This version utilizes a PIC16F876, but it's easy to port the schematic and software to other PIC's.
The MMC is connected to the SPI pins of the PIC via simple resistor voltage dividers to transform the +5V high levels to about 3.3V used by the MMC. The supply voltage for the MMC (2.7V - 3.6V) comes from a LD1086V33 voltage regulator (3.3V) or equivalent. It is possible to run the PIC at 3.3V, but then the AD converters are not as stable as at 5V. The data-out pin from the MMC goes directly to the PIC, because 3.3V is high for the PIC anyway... read more at: www.captain.at/electronics/pic-mmc/