Introduction_ARM 7
LPC2148
PINSEL register : ( 32 bit ) Pin select register.
This register is use to determine /assign function of/to a particular pin on LPC2138.
PINSEL0 ---> Port 0.0 to Port 0.15
PINSEL1 ---> Port 0.16 to Port 0.31
Reserved ---> Port 1.0 to Port 1.15
PINSEL2 ---> Port 1.16 to Port 1.32
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PINSEL 0 |
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PINSEL 1 |
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PINSEL 2 |
0 0 - First Config.
0 1 - Second Config.
1 0 - Third Config.
1 1 - Fourth Config.
Suppose you want to set P0.15 in SECOND config.
The value of Pinsel would be :
PINSEL0 = 0X40000000;
Input / Output Directional register : ( 32 bit ) IODIR register.
This register is use to select the direction of the pin.
It can be either an input or an output.
Input = 0 & Output = 1
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IODIR0 for Port 0 |
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IODIR1 for Port 1 |
Suppose you want to set P0.0 ,P0.1 & P0.2 in output config.
IODIR0 = 0X00000007;
Input / Output Set register : ( 32 bit ) IOSET register.
This register is use to set the pin.
Giving value 1 to a particular pin will send high voltage to a device connected to that port pin.
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IOSET0 for Port 0 |
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IOSET1 for Port 1 |
Suppose you want to set P0.0 ,P0.1 & P0.2 to high.
IOSET0 = 0X00000007;
Input / Output Clear register : ( 32 bit ) IOCLR register.
This register is use to clear the pin.
Giving value 1 to a particular pin will send low voltage to a device connected to that port pin.
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IOCLR0 for Port 0 |
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IOCLR1 for Port 1 |
Suppose you want to clear P0.0 ,P0.1 & P0.2 to high.
IOCLR0 = 0X00000007;
Input / Output Pin register : ( 32 bit ) IOPINX register.
This register is use to check the current status of the pin.
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IOPIN0 for Port 0
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