pic 16f877a transmits serial data when in reset

Discussion in 'Embedded Systems and Microcontrollers' started by rlaybourn, Jul 21, 2011.

  1. rlaybourn

    Thread Starter New Member

    May 22, 2011
    I have a pic 16f877a I notice that when i pull the reset pin low to reset the pic starts to transmit a constant stream of 0x00 . The pic is connected to a max232 to handle the level conversion to pc serial port. The program I am running on the chip works fine but this transmitting a stream of null chars is causing the bootloader program not to work. Two different chips do this so i dont know is this the standard behavious for pic chips in reset ?
  2. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    Very strange. I sniffed out the errata sheets on this but did not see any mention of this. A reset should, well, reset! Leave that module off with nothing running anywhere. It's active low so unless you are not pulling it truly low then the silicon is suspect.

    I would bang on the Microchip boards and ask there, and/or open a support ticket.