SD/MMC Drivers
MMCPlus
Card
Size
32 x 24 x 1.4 mm
Pin Count
13
Description
Most current MMC cards can
operate with 1, 4 or 8 data lines,
though legacy media were
limited to a single data line. The
MMCmobile
18 x 24 x 1.4 mm
13
maximum clock frequency is 20
MHz, providing for maximum
theoretical transfer speeds of
20 MB/s, 80 MB/s and 160
MB/s for the three possible bus
widths.
MMCmicro
SD or SDHC
14 x 12 x 1.1 mm
32 x 24 x 1.4 mm
13
9
SD cards can operate in
cardmode with 1 or 4 data lines
or in SPI mode. The maximum
SDmini
21.5 x 20 x 1.4 mm
11
clock frequency is 25 MHz,
providing for maximum
theoretical transfer speeds of
25 MHz and 50 MHz for the two
possible bus widths.
SDmicro
15 x 11 x 1.0 mm
8
Table 17-1 SD/MMC Devices
SD/MMC cards can be used in two modes: card mode (also referred to as MMC mode and
SD mode) and SPI mode . The former offers up to 8 data lines (depending on the type of
card); the latter, only one data line, but the accessibility of a communication bus common
on many MCUs/MPUs. Because these modes involve different command protocols, they
require different drivers.
175
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