Hi Team,
one of my customer using P1.3 as button input. as below.
Because button didn't work in the field, they tested the pin after remove SW2 and C2, and they get this result.
R7 Resistor Value |
RETURN Pin Voltage(V) (P1.3/TA1.2/A3/C3) |
Input Value by MSP |
1K |
2.57 |
High |
5.1K |
1.67 |
Low |
10K |
1.23 |
|
100K |
0.22 |
GPIO output mode works fine. they were able to drive P1.3 normal.
In conclusion, it seems like internal resistance value of P1.3 became about 8k ohm.
How can this happen? could you guess any reason for this?
here is their register settings.
P1DIR &=~ BIT3; //Input
P1IES |= BIT3; // Hi->Lo Interrupt
P1IFG &=~ BIT3; // Interrupt flag
P1IE |= BIT3; // Interrupt Enable
Best Regards,
Ted