WDT times not as expected 18f46k80
hi guys i am trying to find why the WDT timeout is not as i am expecting
as i understand it the WDT sends a 4ms pulse originated from the 31Khz osc to the post scaler and gives 4ms x postscaller when the sleep is set
i have set it up for 4ms x 16384 = 65.53 sec , but its triggering at @ 93sec
wondering what may be the problem as i am sure the osc is set correctly to use the LF-INTOSLFO
Code:;----- CONFIG1L Options -------------------------------------------------- CONFIG XINST = OFF CONFIG SOSCSEL = DIG ; Digital (SCLKI) mode; I/O port functionality of RC0 and RC1 is enabled CONFIG INTOSCSEL = LOW ; LF-INTOSC in low-power mode during Sleep CONFIG RETEN = ON ; Ultra Low power regulator is Enabled (Controlled by SRETEN bit)when in sleep WDTCON.4) ;----- CONFIG1H Options -------------------------------------------------- CONFIG IESO = OFF CONFIG FCMEN = OFF CONFIG PLLCFG = OFF CONFIG FOSC = INTIO2 ; Internal RC oscillator , PORTA.6 , PORTA.7 as I/O ;----- CONFIG2L Options -------------------------------------------------- CONFIG BORPWR = ZPBORMV ; ZPBORMV instead of BORMV is selected CONFIG BORV = 2 ; 2V CONFIG BOREN = SBORDIS ; Enabled in hardware, SBOREN disabled CONFIG PWRTEN = OFF ;----- CONFIG2H Options -------------------------------------------------- CONFIG WDTPS = 16384 ; 1:32768 = 4ms x 32768 = aprox 139 sec for watchdog timeout CONFIG WDTEN = SWDTDIS ; WDT enabled in hardware; SWDTEN bit disabled ;----- CONFIG3L Options -------------------------------------------------- ; no register in the device ;----- CONFIG3H Options -------------------------------------------------- CONFIG MCLRE = ON ; MCLR ENabled FOR DIAG , RG5 DISabled CONFIG MSSPMSK = MSK7 ; 7 Bit address masking mode CONFIG CANMX = PORTB ; ECAN TX and RX pins are located on RB2 and RB3, respectively ;----- CONFIG4L Options -------------------------------------------------- CONFIG BBSIZ = BB1K ; 1K word Boot Block size CONFIG STVREN = ON ;----- CONFIG5L Options -------------------------------------------------- CONFIG CP0 = ON ; MEMORY BLOCK 0 CODE PROTECT BIT - 7KW 800h - 3FFFh ( when 1K BOOT OPTION used ) CONFIG CP1 = ON ; MEMORY BLOCK 1 CODE PROTECT BIT - 8KW 4000h - 7FFFh CONFIG CP2 = ON ; MEMORY BLOCK 2 CODE PROTECT BIT - 8KW 8000h - BFFFh CONFIG CP3 = ON ; MEMORY BLOCK 3 CODE PROTECT BIT - 8KW C000h - FFFFh ;----- CONFIG5H Options -------------------------------------------------- CONFIG CPD = OFF ; EEPROM DATA PREOTECT BIT - EXTERNAL R/W CONFIG CPB = ON ; BOOT BLOCK CODE PROTECT BIT ;----- CONFIG6L Options -------------------------------------------------- CONFIG WRT0 = OFF ; MEMORY BLOCK WRITE PROTECT BIT CONFIG WRT1 = OFF CONFIG WRT2 = OFF CONFIG WRT3 = OFF ;----- CONFIG6H Options -------------------------------------------------- CONFIG WRTD = OFF ; EEPROM WRITE PROTECT BIT - INTERNAL AND EXTERNAL CONFIG WRTB = ON ; BOOT BLOCK WRITE PROTECT CONFIG WRTC = ON ; CONFIGURATION REGISTER WRITE PROTECT BIT ;----- CONFIG7L Options -------------------------------------------------- CONFIG EBTR0 = OFF ; MEMORY READ TABLE BLOCK PROTECT CONFIG EBTR1 = OFF CONFIG EBTR2 = OFF CONFIG EBTR3 = OFF ;----- CONFIG7H Options -------------------------------------------------- CONFIG EBTRB = OFF ; TABLE READ PROTECT BOOTCode:'----------- 18F46K80 - PIC chip Dephalt settings -------------------- OSCCON = %00110000 ' Select 1Mhz - using 1Mhz internal with PPLx4 in Config1H<3:0> = IDLEN =0 , 8Mhz , OSTS=0,RFIOFS=1,RC_Run (1x) OSC using PLL ' Bit 7 IDLEN =0 ( sleep mode when sleep instraction executed) ' Bits 6-4 - 111 = 16Mhz , 110 = 8MHz ,101 = 4 MHz, 100 = 2MHz 011 = 1MHz ' If INTTSRC=0 and MFIOSEL= 0 then 010 = HF-INTOSC/32 (500Khz), 001 = HF-INTOSC/64 (250Khz) ,000 = LF-INTOSC (31.25Khz) ' If INTTSRC=0 and MFIOSEL= 1 then 010 = MF-INTOSC (500Khz), 001 = MF-INTOSC/2 (250Khz) ,000 = LF-INTOSC (31.25Khz) ' If INTTSRC=1 and MFIOSEL= 0 then 010 = HF-INTOSC/32 (500Khz), 001 = HF-INTOSC/64 (250Khz) ,000 = HF-INTOSC/512 (31.25Khz) ' If INTTSRC=1 and MFIOSEL= 1 then 010 = MF-INTOSC (500Khz), 001 = MF-INTOSC/2 (250Khz) ,000 = MF-INTOSC/16 (31.25Khz) ' Note: INTSRC = OSCTUNE<7> and MFIOSEL = OSCCON2<0> ' Bit 3 - OSTS = 0 - Osc startup time out is ruinning from internal OSC ( HF, MF or -INTOSLFC) ' Bit 2 - HFIOFS =1 ( INTOSC Frq stable bit - 1 = stable , 0 = not stable ' Bits 1-0 - 00= Dephalt Pri OSc ( OSC1/2 or HF-INTOSC with/without PLL set in FOSC,3:0> config1H <3.0> ' 01 = SOSC osc ' 1x = Internal osc ( LF, MF,HF-INTOSC) ' OSCCON2 = $00 ' Bit 7 n/a , Bit 6 - SOSCRUN - Run status bit , Bit 5-4 n/a, ' Bit 3 = SOASCGO - Osc Start control bit 1 = OSC running , 0 = OSC shut off if no requests for it ' Bit 2 n/a , Bit 1 - MFIOFS 1= MFINTOSC stable 0 = Not stable ' Bit 0 MFIOSEL - 1 = MF-INTOSC replaces HF-ISTOSC Freq for 500Khz,250Khz,31.25KHz) 0 = MF-INTOSC not used OSCTUNE = %00000000 ' Bit 7 - INTSRC - internal LF Source Select 1 = 31.25 from 16Mhz Internal /512 HF-INTOSC ) 0 = Internal 31khz OSC ' Bit 6 - PLLEN - 1 PLL enabled , 0 = PLL disabled ' Bits 5-0 Frequancy callibaration 00000 = centre Frq WDTCON = %00010000 ' use ultra low power mode when in sleep - disable regulator in sleep mode ' Bit7 = REGSLP- Regulator Voltage Sleep Enable - 1= Reg goes into low-power Mode when in sleep mode ,0 = Reg stay in normal mode ' Bit6= n/a , Bit5 = ULPLVL - Ultra lowpower Wakeup output sel 1= Vout on RA0 0= Vout on RA1 ( no effect if WDTEN in config is set ) ' Bit4= SRETEN = Regulator Volt Sleep Disable bit - 1= goes into Ultra lOwpower mode in sleep ( CONFIG1L.0 =0 MUST BE SET) ' Bit3=n/a , Bit2 = ULPEN - Ultra Low Power Wakup Module enable 1 = enabled , 0 = disabled ' Bit1=ULPSINK- Ultra Low-power Wakeup Current Sink Enable 1= Sink enabled 0 = Sink disabled ( Not valid if ULPEN=0 ) ' Bit0= SWDTEN -Watchdog Timer Enable = 1= enable watchdog 0 = Disable Watchdog ( no effect if WDTEN in config is set )
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