Datasheet

MMC/SD
MikroElektronika
MMC/SD Additional Board
A MultiMedia Card (MMC) is a memory card manufactured in Flash technology. The standard size of these cards is 24×32×1.4 mm.
MMC cards have been superseded by Secure Digital Cards (SD cards) lately, but they are still very popular and widely used because
they can be utilized with most devices that support SD cards.
Both types of cards are used as memory data storage in portable devices such as cameras, digital audio players, cellular phones, etc.
Most modern computers are supplied with an MMC/SD slot that can read both MMC and SD cards. The MMC/SD additional board
enables data read/write between a microcontroller and MMC/SD cards. Data transfer is performed via a standard Serial Peripheral
Interface (SPI). Due to built-in voltage level converters, such as 74LVCC3245, these cards may be used both with 3.3V and 5V
microcontrollers. The position of jumper J1 depends on the power supply voltage level. The MMC/SD additional board is connected to
Mikroelektronika’s development systems via a standard IDC10 connector.
Figure 3: MMC/SD additional board connection schematic
Figure 1: MMC/SD additional board
Figure 2: MMC/SD additional board connected to a development system