18f26k20 working problem

[bugi]

Hi everybody,

I live a problem with 18f26k20.

My codes working perfect with 18f46k20. I use serial CLCD with Pll 16x4=64 Mhz. (also all xtal freq.)
I init the lcd and send data or command with 4 pins and I don't use any spi or other command.
I use 1 or 0 with port and pin name. (ex. Portb.1=0 faster than the shiftout )

But 18f26k20 drives the same lcd only with 4-8-12-16 Mhz or 4Mhz with pll=16 Mhz. It doesn't work faster than 16 Mhz. (32 or 64 Mhz.) Pic works all speed also 32 or 64 Mhz but can not drive or init this LCd. I have changed the old pic with a new one but the result is the same. I'm going crazy...

Are there any factory defect or what can it be ? I use soic package.

Best Regards.

Bugra

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[fanie]

I live a problem with 18f26k20

Change your lifestyle or it's going to kill you - eventually

How big is the program you're pumping in the 18f26k20 ?

[normnet]

Hi everybody,

I live a problem with 18f26k20.

My codes working perfect with 18f46k20. I use serial CLCD with Pll 16x4=64 Mhz. (also all xtal freq.)
I init the lcd and send data or command with 4 pins and I don't use any spi or other command.
I use 1 or 0 with port and pin name. (ex. Portb.1=0 faster than the shiftout )

But 18f26k20 drives the same lcd only with 4-8-12-16 Mhz or 4Mhz with pll=16 Mhz. It doesn't work faster than 16 Mhz. (32 or 64 Mhz.) Pic works all speed also 32 or 64 Mhz but can not drive or init this LCd. I have changed the old pic with a new one but the result is the same. I'm going crazy...

Are there any factory defect or what can it be ? I use soic package.

Best Regards.

Bugra

This is what I arrived at.

Norm

Device = 18F26K20  

Config_Start
'   FOSC = HS ; HS oscillator
'   FOSC = HSPLL ; HS oscillator, PLL enabled (Clock Frequency = 4 x FOSC1)
   FOSC = INTIO67 ; INTERNAL OSCILLATOR .PORTA.6 AND 7 I/O's
   FCMEN = OFF ; Fail-Safe Clock Monitor disabled
   IESO = OFF ; Oscillator Switchover mode disabled
   PWRT = On ; PWRT enabled
   BOREN = On ; Brown-out Reset enabled and controlled by software (SBOREN is enabled)
   BORV = 27 ; VBOR set to 2.7 V nominal
   WDTEN = OFF ; WDT is controlled by SWDTEN bit of the WDTCON register
   MCLRE = On ; MCLR pin enabled, RE3 input pin disabled
   HFOFST = OFF ; The system clock is held off until the HF-INTOSC is stable.
   LPT1OSC = OFF ; Disabled, T1 operates in standard power mode.
   PBADEN = OFF ; PORTB<4:0> pins are configured as digital I/O on Reset
   STVREN = On ; Stack full/underflow will cause Reset
   LVP = OFF ; Single-Supply ICSP disabled
   XINST = OFF ; Instruction set extension and Indexed Addressing mode disabled (Legacy mode)
   Debug = OFF ; Background debugger disabled, RB6 and RB7 configured as general purpose I/O pins
   CP0 = OFF ; Block 0 (000800-003FFFh) not code-protected
   CP1 = OFF ; Block 1 (004000-007FFFh) not code-protected
   CP2 = OFF ; Block 2 (008000-00BFFFh) not code-protected
   CP3 = OFF ; Block 3 (00C000-00FFFFh) not code-protected
   CPB = OFF ; Boot block (000000-0007FFh) not code-protected
   CPD = OFF ; Data EEPROM not code-protected
   WRT0 = OFF ; Block 0 (000800-003FFFh) not write-protected
   WRT1 = OFF ; Block 1 (004000-007FFFh) not write-protected
   WRT2 = OFF ; Block 2 (008000-00BFFFh) not write-protected
   WRT3 = OFF ; Block 3 (00C000-00FFFFh) not write-protected
   WRTB = OFF ; Boot block (000000-0007FFh) not write-protected
   WRTC = OFF ; Configuration registers (300000-3000FFh) not write-protected
   WRTD = OFF ; Data EEPROM not write-protected
   EBTR0 = OFF ; Block 0 (000800-003FFFh) not protected from table reads executed in other blocks
   EBTR1 = OFF ; Block 1 (004000-007FFFh) not protected from table reads executed in other blocks
   EBTR2 = OFF ; Block 2 (008000-00BFFFh) not protected from table reads executed in other blocks
   EBTR3 = OFF ; Block 3 (00C000-00FFFFh) not protected from table reads executed in other blocks
   EBTRB = OFF ; Boot block (000000-0007FFh) not protected from table reads executed in other blocks
Config_End

'    XTAL = 64      ' REQUIRES PLL  ' USE 16 MHz CRYSTAL & DECLARE: XTAL = 64
'    XTAL = 48      ' REQUIRES PLL  ' USE 12 MHz CRYSTAL & DECLARE: XTAL = 48
'    Xtal = 40      ' REQUIRES PLL  ' USE 10 MHz CRYSTAL & DECLARE: XTAL = 40
'    Xtal = 20
    XTAL = 16  'INTERNAL OSCILLATOR MUST BE 8 OR 16 FOR PLL, CONFIGURE OSCCON AND OSCTUNE FOR PLL

    'UNCOMMENT FOR INTERNAL ONLY
    OSCCON = %01110110  'INTERNAL OSCILLATOR
    OSCTUNE = %01000000 '%x1xxxxxx = PLL ENABLED  MUST BE 8 OR 16MHz IN OSCCON FOR PLL

[bugi]

Hi,

How big is the program you're pumping in the 18f26k20 ?

There are only lcd init routines in 18f25k20. And I clear the screen difficult colors.
With 18f46k20, I print to screen many pictures from sd and play wav files. Don't worry I protect myself

Dear Norm,

I have tested your configs it woks but without pll. Pll doesn't work. Osctune =$40 doesn't change anything.

Otherwise, why doesn't device work without config. It should work only Xtal=16 and pll_req 1 declares =64Mhz as usual.

Is there any problem with Proton? Is It possible?

I downloaded errata pdf from Microchip and there are a lot of problems in these pics. But I didn't see anyting about this problem for revision ID (0xC) of mine.

18f46k20 works but 18f26k20 doesn't work. Each one is the same revision (0xC) '26k20 works 16Mhz with internal or external osc. I have bought 20 pieces 26k20 and 10 pieces 46k20. If these are really defected pics I'm going to fire them and I'll always love Microchip Because I don't want to give my time anymore

I open all advices

Thanks&Regards

Bugra

[bugi]

Hi,

The bad news.

I've tried my other 18f46k20 micros and they don't work like 26k20. I can't belive it, only one pic has worked I think there is a ghost inside

I looked to pins with scope, clock, rs and cs pins at 4-8-10-12-16Mhz without pll and 4-8-10-12-16 with pll.
Everything looks proportional but only works 4Mhz with pll and all other ocs without pll. (works lcd module)
At the same circuit and codes are ok with 18f452. 4-8-10-12-16-20 Mhz and 4-8-10Mhz with pll are OK.

I don't understand, maybe 18FxxKxx family don't like me

Regards.

Bugra