User`s manual

High Performance Low Cost Embedded Systems
GPIO
GPIO is the abbreviated form of General Purpose Input Output. The mini2440 has a 34 Pin 2.0mm
GPIO interface, i.e. CON4. In fact, CON4 has not only quite a few GPIO pins but also some CPU pins
such as AD0-AIN3, CLKOUT and so on. The SPI interface, I2C interface, GPB0 interface and GPB1
in the schematic are all GPIO, but they are marked as special function interfaces. They can be
configured for other purposes too by setting related CPU registers.
CON4 Name Notes CON4 Name Notes
1 VDD5V 5V Power (Input or VDD33V 3.3V Power (Output)
Output)
2
3 GND 4 nRESET Reset (Output) GND
5 AIN0 AD Input Channel 0 nel 1 6 AIN1 AD Input Chan
7 AIN2 AD Input Channel 2 8 AIN3 AD Input Channel 3
9 EINT0 EINT0/GPF0 10 EINT1 EINT1/GPF1
11 EINT2 EINT2/GPF2 12 EINT3 EINT3/GPF3
13 EINT4 EINT4/GPF4 14 EINT5 EINT5/GPF5
15 EINT6 EINT6/GPF6 16 EINT8 EINT8/GPG0
17 EINT9 EINT9/GPG1 18 EINT11 /nSS1 EINT11/GPG3
19 EINT13 /SPIMISO1 OSI1EINT13/GPG5 20 EINT14 EINT14/GPG6/SPIM
21 EINT15 EINT15/GPG7/SPICLK1 22 EINT17 EINT17/GPG9/nRST1
23 EINT18 NT18/GPG10/nCTS1 24 EINT19 NT19/GPG11 EI EI
25 SPIMISO I 6 SPIMISO/GPE11 26 SPIMOS SPIMOSI/EINT14/GPG
27 SPICLK SPICLK/GPE13 28 nSS_SPI /GPG2 nSS_SPI/EINT10
29 I2CSCL I2CSCL/GPE14 30 I2CSDA I2CSDA/GPE15
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