Anonymous
Not applicable
Jun 24, 2009
03:28 AM
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Jun 24, 2009
03:28 AM
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.
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.
1 Reply
Anonymous
Not applicable
Jun 29, 2009
05:08 AM
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Jun 29, 2009
05:08 AM
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
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