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Reference Design Example
ARM DUI 0163B
Copyright © 2001-2003. All rights reserved.
4-21
4.8
GPIO
There are two 32-bit GPIO blocks instantiated in the example design. Each GPIO
provides 32 general-purpose input and output signals that are connected to the
connectors J16 and J17. GPIOB is also connected to the 38-way Mictor connector J7
for easy connection to a logic analyzer. The GPIO registers are shown in Table 4-12.
4.8.1
Data output set register
The GPIO_DATASET location is used to set individual GPIO output bits as follows:
1 = SET the associated GPIO output bit
0 = leave the associated GPIO bit unchanged.
4.8.2
Read data input register
Read the current state of the GPIO input bits from this location.
4.8.3
Data register output clear
The GPIO_DATACLR location is used to clear individual GPIO output bits as follows:
1 = CLEAR the associated GPIO output bit
0 = leave the associated GPIO bit unchanged.
4.8.4
Read data output pins
Read the current state of the GPIO output bits from this location.
Table 4-12 GPIO registers
Address offset
Name
Access
Size
Function
0x000000
GPIO_DATASET
Write
32
Data output set
GPIO_DATAIN
Read
32
Read data input pins
0x000004
GPIO_DATACLR
Write
32
Data register output clear
GPIO_DATAOUT
Read
32
Read data output pins
0x000008
GPIO_DIRN
Read/write
32
Data direction
Содержание IM-AD1
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Страница 20: ...Introduction 1 8 Copyright 2001 2003 All rights reserved ARM DUI 0163B ...
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