Hello,
I'm considering using HVI pin for wake-up function. the input voltage of the wake-up signal would be 12~14V
I have a few question for it..
1. is it needed to be a digital input to detect a wake up signal (DC 12V)?
2. in the datasheet, the structure of internal pull down resistor is this..
[Figure 2-37]
HV supply(12V) ----------- [ 10K ] ----- [ HVI pin ] ------ [ 40K ] ------ [ 610K / 1050K ] -----GND
l l
SW ------ GND Digital in
simply calculated this regarding as voltage divider, in case of the variable resister is 610K,
Digital in is 11.1V and 1050K, 11.454V..
this is not a mcu voltage level.. is this the right way for designing HVI?
if this is wrong, how to calculate this?
extra) if you have a example source for HVI or know where it is, please notiy me..
thank you
Solved! Go to Solution.
Hi Daehyeon,
1. Yes, the Port L pin has to be configured into the digital mode when we want to use interrupt (in run mode) / wake-up (in stop mode) feature.
2. In the Digital Mode Operation (DIENL=1 & PTAENL=0) is this voltage divider disabled (PTAENL=0) and input voltage is detected directly through 50k (10k external + 40k internal) current limited link by port L input buffer. This input buffer is slightly different than input buffer at standard GPIO pins and the threshold voltages are specified in Table G-1 in RM.
Since there is high impedance at Port L pin input, the pin is not directly clamped to VDDX power supply rails.
Unfortunately, I am afraid that we don’t have any special example project for HWI wake-up. But for HVI0 you may try something like:
interrupt 79 void PortL_ISR(void)
{
/* DO SOMETHING HERE */
PIFL = 0x01; // clear flag to exit interrupt routine
}
void main(void) {
/*** Digital input ** Support wakeup from stop ***/
PTAENL_PTAENL0 = 0; // PL0 disconnect from ADC channel
DIENL_DIENL0 = 1; // Enable digital input buffer
//////////////////////////////////////////////////
asm ANDCC #0x7F; // clear S bit - enable the stop mode. If the S bit is not
// cleared then STOP instruction has no effect and is
// executed as a dummy instruction NOP.
EnableInterrupts;
for(;;) {
asm STOP;
}
}
I hope it helps you.
Have a great day,
Radek
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Hi Daehyeon,
1. Yes, the Port L pin has to be configured into the digital mode when we want to use interrupt (in run mode) / wake-up (in stop mode) feature.
2. In the Digital Mode Operation (DIENL=1 & PTAENL=0) is this voltage divider disabled (PTAENL=0) and input voltage is detected directly through 50k (10k external + 40k internal) current limited link by port L input buffer. This input buffer is slightly different than input buffer at standard GPIO pins and the threshold voltages are specified in Table G-1 in RM.
Since there is high impedance at Port L pin input, the pin is not directly clamped to VDDX power supply rails.
Unfortunately, I am afraid that we don’t have any special example project for HWI wake-up. But for HVI0 you may try something like:
interrupt 79 void PortL_ISR(void)
{
/* DO SOMETHING HERE */
PIFL = 0x01; // clear flag to exit interrupt routine
}
void main(void) {
/*** Digital input ** Support wakeup from stop ***/
PTAENL_PTAENL0 = 0; // PL0 disconnect from ADC channel
DIENL_DIENL0 = 1; // Enable digital input buffer
//////////////////////////////////////////////////
asm ANDCC #0x7F; // clear S bit - enable the stop mode. If the S bit is not
// cleared then STOP instruction has no effect and is
// executed as a dummy instruction NOP.
EnableInterrupts;
for(;;) {
asm STOP;
}
}
I hope it helps you.
Have a great day,
Radek
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------