CONFIG issues with 18F26K22

[towlerg]

FWIW if you want to use your Pickit2, heres a modified PK2DeviceFile which can programme 18F26K22 and a couple of simple apps for manipulating the dat file.

[MikeBZH]

Many thanks tumbleweed, it works now !

I can't understand why Microchip make such complex thinks sometimes
"Keep it simple" should be the rule !

George, would your mods for the PicKit2 provide also the debug capability or only programming ?

Best regards
MikeBZH

[towlerg]

@Mike. No, just stand alone PK2cmd.exe and Pickit2v2.exe.

For what it's worth the config I use (in Proton but easily transposed)

	' internal clock 16MHz with 4xPLL = 64MHz
  $if _device = _18F26K22
  	Config_Start
  	  FOSC = INTIO67	   ; Internal oscillator block
  	  PLLCFG = On	       ; Oscillator multiplied by 4
  	  PRICLKEN = On	     ; Primary clock enabled
  	  FCMEN = OFF	       ; Fail-Safe Clock Monitor disabled
  	  IESO = OFF	       ; Oscillator Switchover mode disabled
  	  PWRTEN = On	       ; Power up timer enabled
  	  BOREN = On	       ; Brown-out Reset enabled and controlled by software (SBOREN is enabled)
  	  BORV = 285	       ; VBOR set to 2.85 V nominal
  	  WDTEN = OFF	       ; Watch dog timer is always disabled. SWDTEN has no effect.
  	  WDTPS = 32768	     ; 1:32768
  	  CCP2MX = PORTC1	   ; CCP2 input/output is multiplexed with RC1
  	  PBADEN = OFF	     ; PORTB<5:0> pins are configured as digital I/O on Reset
  	  CCP3MX = PORTB5	   ; P3A/CCP3 input/output is multiplexed with RB5
  	  HFOFST = On	       ; HFINTOSC output and ready status are not delayed by the oscillator stable status
  	  T3CMX = PORTC0	   ; T3CKI is on RC0
  	  P2BMX = PORTB5	   ; P2B is on RB5
  	  MCLRE = INTMCLR	   ; RE3 input pin enabled; MCLR disabled
  	  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	       ; Disabled
  	  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
  	  WRTC = OFF	       ; Configuration registers (300000-3000FFh) not write-protected
  	  WRTB = OFF	       ; Boot Block (000000-0007FFh) 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
  $endif

[Dave]

MikeBZH, Here is the config I use for almost all of my 26K22 projects: 64Mhz internal OSC.

#CONFIG
;----- CONFIG1H Options --------------------------------------------------
__config _CONFIG1H, _FOSC_INTIO7_1H & _PLLCFG_ON_1H & _PRICLKEN_ON_1H & _FCMEN_ON_1H & _IESO_OFF_1H
;----- CONFIG2L Options --------------------------------------------------
__config _CONFIG2L, _PWRTEN_ON_2L & _BOREN_ON_2L & _BORV_190_2L
;----- CONFIG2H Options --------------------------------------------------
__config _CONFIG2H, _WDTEN_OFF_2H & _WDTPS_32768_2H
;----- CONFIG3H Options --------------------------------------------------
__config _CONFIG3H, _CCP2MX_PORTB3_3H & _PBADEN_OFF_3H & _HFOFST_OFF_3H & _T3CMX_PORTB5_3H & _MCLRE_EXTMCLR_3H
;----- CONFIG4L Options --------------------------------------------------
__config _CONFIG4L, _STVREN_ON_4L & _LVP_OFF_4L & _XINST_OFF_4L & _DEBUG_OFF_4L
#ENDCONFIG

[Charlie]

If you are really using a crystal then you need FOSC = LP (or the correct setting for a low power crystal with your device.)
Your file is set for a medium power high speed resonator

[tumbleweed]

LP, XT, and HS settings are all for use with crystals.
See section 2.5.3 in the datasheet.

[Charlie]

Tumbleweed - You're right - I should have looked it up instead of going by memory.

[MikeBZH]

Thank you Dave,

I need some frequency accuracy. This is why I don't use the internal oscillator but an external xtal and in that case the CONFIG is a little bit different.

But this issue is fixed now.

I am now faced with reading the port A digital inputs. Quite simple question but for an unknown reason it behaves differently than with the 18F2685.

73
MikeBZH (F8DFN)

[tumbleweed]

I am now faced with reading the port A digital inputs

Both devices have analog functions on portA but the function is selected differently.
On the 2685 you use the ADCON1 register, while with the 26K22 it's set with the ANSELA register.

[Dave]

Mike, here is the setup for one of my projects:

ANSELA = %00101111 'PORTS A5,A3,A2,A1,A0 ALALOG, A7,A6,A4 DIGITAL
ANSELB = %00100000 'PORTS B7,B6,B4,B3,B2,B1,B0 DIGITAL BUFFERED, B5 ANALOG
ANSELC = %00000000 'PORTS C7,C6,C5,C4,C3,C2,C1,C0 DIGITAL BUFFERED

Hope this helps...