Datasheet

page 29
v7
multimedia
Secure Digital (SD) is a non-volatile
memory card format developed for use
in portable devices. It comes in dierent
packages and memory capacities. It is
mostly used for storing large amounts
of data. EasyPIC Fusion
™
v7 features the
microSD card slot. The microSD form
factor is the smallest card format currently
available. It uses standard SPI user inter-
face with minimum additional electronics,
mainly used for stabilizing communication
lines which can be signicantly distorted
at high transfer rates. Special ferrite is
also provided to compensate the voltage
and current glitch that can occur when
pushing-in and pushing-out microSD card
into the socket.
Enabling microSD
In order to access microSD card, you
must enable SPI communication
lines using SW13.1 – SW13.3 DIP
switches as well as Chip Select (CS)
and Card Detect (CD) lines using
SW14.1 and SW14.2 switches.
1
2
4
5
6
7
G
CS
Din
+3.3V
SCK
GND
Dout
CD
GND
CN27
MICROSD
VCC-MMC
R52
10K
R51
10K
SD-CS#
PH_MISO
PH_MOSI
PH_SCK
SD-CD#
R56 27
microSD
CA RD SLOT
FP2
FERRITE
E13
10uF
VCC-3.3VVCC-MMC
C30
100nF
1 2 3 4 5 6 7 8
O
N
SW13
PH_MOSI
PH_MISO
PH_SCK
MOSI
MISO
SCK
1 2 3 4 5 6 7 8
O
N
SW14
SD-CS#
SD-CD#
RD12
RD13
FP2
DATA BUS
microSD card slot
Figure 15-1:
microSD card slot
connection schematic