Etteam ET-STM32F103, User Manual, Page: 14 / 25

User’s Manual of Board Microcontroller version ET-STM32F103 (ARM Cortex-M3)
ETT CO., LTD
-
13
- WWW.ETT.CO.TH
Application of SD Card Memory
Board ET-STM32F103 supports the connection of SD Card
Memory by using SPI Mode Interface; moreover, all
circuits that are connected with SD Card use signal pins
of function SPI1 and GPIO from MCU as follows;
•
CD/DAT3 uses PA4(SPI1-SS).
•
CLK uses PA5(SPI1-SCK).
•
DAT0 uses PA6(SPI1-MISO).
•
CMD uses PA7(SPI1-MOSI).
•
CD uses PA8(GPIO) to check the insertion of memory
card; if user does not need to use this pin, can
set Jumper J23 on [2-3] to remove the connection
between Pin PA8 and Pin CD(Card Detection) of SD
Card.
•
WP uses PC6 (GPIO) to check the setting of Write
Protect of memory card; if user does not need to
use this pin, can set Jumper J24 on [2-3] to
remove the connection between Pin PC6 and Pin WP
(Write Protect) of SD Card.
+3V3
R41
1k
R37
10k
R42 1k
R36
10k
R38
22k
R39
22k
C22
100n
C21
10uF
PA8
PA4
PA7
PA5
PA6
PC6
CD/DAT3
1
CMD
2
VSS
3
VDD
4
CLK
5
DAT0
7
VSS
6
DAT1
8
DAT2
9
CD
10
WP
11
G1
12
G2
13
SK1
SD/MMC
1 2 3
J24
WP
1 2 3
J23
CD