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zmtek
Joined: 19 Jan 2013
Posts: 5
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| pic 16LF1825 brownout reset when wake up |
 Posted: Mon Feb 18, 2013 7:40 am |
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Hi,
I am running following code to wake up from sleep when receiving char
over rs232 on 16F1825 and it is running fine, when programmed
same code to 16LF1825 a brownout reset occuring instead of wake up.
Everything is same - board design, power, hex etc...
the only difference is 16F1825 is DIP package and 16LF1825 is QFN.
the same occurs when i use change on PORT A interrupt for wake
up source.
Any ideas?
| Code: |
#include <16LF1825.h>
#FUSES INTRC_IO,NOWDT,NOPUT,NOMCLR,NOPROTECT,NOCPD,BROWNOUT_NOSL,NOCLKOUT,NOIESO,NOFCMEN,NOSTVREN,BORV19,NODEBUG,NOLVP
#use delay(clock=16000000)
#use rs232 (baud=9600,parity=N,bits=8,xmit=PIN_c4, rcv=PIN_c5)
#bit WUE_BIT=GETENV("BIT:WUE")
int8 dummy=0;
int8 stat=0;
void main(void)
{
SETUP_DAC(dac_off);
setup_comparator (nc_nc_nc_nc);
setup_adc(ADC_OFF);
setup_adc_ports(NO_ANALOGS);
setup_ccp1(ccp_off);
setup_vref(VREF_OFF);
setup_spi(SPI_DISABLED );
SETUP_WDT(WDT_OFF);
port_a_pullups(false);
port_c_pullups(false);
delay_ms(100);
stat=RESTART_CAUSE();
printf("Startup reset=%02X\r\n",stat);delay_ms(10);
setup_timer_0 (RTCC_INTERNAL | RTCC_DIV_8);
//setup_timer_1(T1_EXTERNAL | T1_DIV_BY_1 |T1_ENABLE_T1OSC);
//setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
//setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
set_tris_a(0b00000000);
set_tris_c(0b00100000);
output_high(PIN_A0); output_high(PIN_A1); output_high(PIN_A2);
output_high(PIN_A3); output_high(PIN_A4); output_high(PIN_A5);
output_high(PIN_c0); output_high(PIN_c1); output_high(PIN_c2);
output_high(PIN_c3); output_high(PIN_c4); output_float(PIN_c5);
enable_interrupts(global);
while(1)
{
WUE_BIT=1;
clear_interrupt(int_rda); enable_interrupts(int_rda);
sleep(); delay_cycles(1);
printf("\r\nwake up\r\n");delay_ms(100);
}
} //end of main()
#int_RDA
RDA_isr()
{
dummy=getc();
} |
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jeremiah
Joined: 20 Jul 2010
Posts: 1349
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| Posted: Mon Feb 18, 2013 3:41 pm |
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| The LF chip has some low power settings that the F chip does not. I would start there and see if any of the defaults would cause your problem. Also, what voltage are you operating the PIC at? |
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zmtek
Joined: 19 Jan 2013
Posts: 5
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| Posted: Mon Feb 18, 2013 4:02 pm |
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i am running it 3.3v down to 2.5V.. I searched data sheet and errdata but
can not find any setting related to LF version :( |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Feb 18, 2013 6:48 pm |
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I looked in the errata sheet for the 16LF1825 and there's nothing on
brownout. I also checked all the older revisions of the errata and
there's nothing either.
But it still really sounds like an errata. So I kept checking. I found this
post on the Microchip forum, which is for a PIC in the same family:
http://www.microchip.com/forums/m591855.aspx
I think this errata is what you have. Here's the errata sheet for
the 16LF1826. Read the section on Brownout:
http://ww1.microchip.com/downloads/en/DeviceDoc/80485K.pdf
It also affects the "Brownout Nosleep" mode. It lists some work-arounds
that you can try.
If you can confirm that it's the same errata, you should report it to
Microchip so they can add it to the 16LF1825 errata sheet. |
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zmtek
Joined: 19 Jan 2013
Posts: 5
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| Posted: Thu Feb 21, 2013 10:44 am |
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The solution in 16f1826 errata works (I switched to brownout_sw and switch off brownout before entering sleep mode). Thank you!
I posted the problem in Microchip official forum and I hope they will update the errata.
Best regards |
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