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PSoC™ Creator & Designer

Anonymous
Not applicable
        When i use cube ice and 21x34 pod practice modify IO port,   
Pod only connect P17 to voltage meter, no other external component.   
the code make me confuse. (PS. Designer 5.0)   
------------------------------------------------------------------------------------------------   
PRT0GS &= ~0x08; //disconnect from global bus   
PRT0DM2 |= 0x08;   
PRT0DM1 &= ~0X08; //DM[2:0]=100, Slow strong high, high-z low   
PRT0DM0 &= ~0x08;   
PRT0DR &= ~0x08;   
   
PRT3GS &= ~0x02; //disconnect from global bus   
PRT3DM2 |= 0x02;   
PRT3DM1 &= ~0x02; //DM[2:0]=100, Slow strong high, high-z low   
PRT3DM0 &= ~0x02;   
PRT3DR |= 0x02;   
-----------------------------------------------------------------------------------------------   
P17 is modified to low normally,   
then modify P31 ,   
P17 become high.....   
   
Can any one tell me why ? please.   
   
=====================================================   
I forget the P17 and P31 both connect to analog bus....   
Forget my stupidity.   
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1 Reply
Anonymous
Not applicable
        Hi,   
   
I do not know what is complete application and in which context you are doing it. But I can explain what these lines of code are doing.   
   
PRT0GS &= ~0x08; //disconnect from global bus   
PRT0DM2 |= 0x08;   
PRT0DM1 &= ~0X08; //DM[2:0]=100, Slow strong high, high-z low   
PRT0DM0 &= ~0x08;   
PRT0DR &= ~0x08;   
   
It will disconnect pin P0[3] from global bus if it was connected earlier. Then it will change drive mode for P0[3] to open drain drive high. Then P0[3] is turned to High-Z output by writing a '0' to its data register.   
   
PRT3GS &= ~0x02; //disconnect from global bus   
PRT3DM2 |= 0x02;   
PRT3DM1 &= ~0x02; //DM[2:0]=100, Slow strong high, high-z low   
PRT3DM0 &= ~0x02;   
PRT3DR |= 0x02;   
   
It will disconnect pin P3[1] from global bus if it was connected earlier. Then it will change drive mode for P3[1] to open drain drive high. Then P3[1] is turned to High output by writing a '1' to its data register.   
   
Best regards,   
Sachin Gupta   
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