PIC18F14K22 and PLL (4 x Phase Lock Loop)

[Momboz]

Hi

I am trying to run a PIC18F14K22 in PLL mode with internal oscillator and PLL (i.e. frequency x 4). The internal clock should be 64'000'000 MHz. Here is my sample code:

asm
    __CONFIG    _CONFIG1H, _FOSC_IRC_1H & _PLLEN_ON_1H & _PCLKEN_ON_1H & _FCMEN_ON_1H & _IESO_ON_1H
    __CONFIG    _CONFIG2L, _BOREN_OFF_2L
    __CONFIG    _CONFIG2H, _WDTEN_OFF_2H & _WDTPS_128_2H
    __CONFIG    _CONFIG4L, _STVREN_ON_4L & _LVP_OFF_4L & _BBSIZ_ON_4L & _XINST_OFF_4L
    __CONFIG    _CONFIG7L, _EBTR0_ON_7L
endasm

    TRISA = 0

main:   
asm
    BSF PORTA, 0
    BCF PORTA, 0
    BSF PORTA, 0
    BCF PORTA, 0
    BSF PORTA, 0
    BCF PORTA, 0
endasm

    goto main
    
    end

This peace of code is assumed to deliver 3 pulses again and again. I got on my scope 3 pulses at 4.20 us duration and I was expecting about 15 ns each pulse duraton since the BSF and BCF instructions last one clock cycle and that cycle should last about 15 ns.

See annexed image for result details on scope.

Any advice to me?

Many thanks in advance.