14
mikroBoard for ARM 144-pin
MikroElektronika
page
5. MicroSD connector
There is a connector CN5 provided on the board that enables the use of microSD card. When inserted, the microSD
card provides additional memory space that the microcontroller can use to store data. Communication between the
microSD card and the microcontroller is performed via the Serial Peripheral Interface (SPI).
Figure 5-1
: MicroSD connector
FERRITE
FB2
VCC-MMC
VCC-3.3
E6
10uF
R12
100K
VCC-MMC
VCC-MMC
P0.18
P0.17
P0.19
P0.25
CS
Dout
Din
SCK
CN5
VCC-3.3
VCC-1.8
VCC-1.8
VCC-1.8
LPC2214
P1.27
V18 GND V3 P3.23 P3.22 P0.
0
P1.31 P3.21 P3.20 P3.19 P3.18 P3.17 P0.
1
P0.
2
V3 P1.26 P3.16 GND P3.15 P3.14 V3
P3.13
GND
P0.
3
P3.12
P0.
6
P0.
4
P3.
11
P0.
7
P1.25
P3.10
P1.24
P0.
5
P3.
9
P3.
8
P3.
7
V18A XT
AL1
XT
AL2
P1.28 GND
GNDA-PPL
P2.21 P2.20
RESET
P2.19 P2.18 P2.17 P2.16 P2.15 P2.14 GND P2.13 P1.29 P2.12 P2.
11
V3
P2.
5
P0.20
P2.
9
P1.30
P0.19
P2.
8
V3
P0.18
P2.
7
GND
P2.10
P2.
6
V18 P2.
4
P2.22
P2.3
GND
P2.2
P2.1
V3
GND
P1.20
P0.17
P0.16
P0.15
P2.0
P3.30
P3.31
P1.21
V3
GND
P0.14
P1.0
P1.1
P3.0
P3.1
P0.11
P0.10
P3.2
P1.23
V3
P1.22
P3.3
P0.9
P0.13
P3.4
P0.8
P0.12
GND
P3.5
P3.6
V3
GND
P0.21
P0.22
P0.23
P1.19
P0.24
GND
P2.23
P2.24
P2.25
P2.26
V3A
P1.18
P2.27
P2.28
P2.29
P2.30
P2.31
P0.25
GND
V3
NC
P3.29
P0.29
P0.27
P3.28
P0.30
P1.17
P3.27
P1.16
P0.28
P3.26
P3.25
P3.24
R11
10K
P0.24
P0.24
CD
G
Figure 5-2
: microSD connector connection schematic
A
B
The pins’ designations have the
following meaning:
CS - Chip Select
Din - Master Out/Slave In (MOSI)
SCK - Clock
Dout - Master In/Slave Out (MISO)