Replacing PIC16C505 with PIC16F505

• Replacing PIC16C505 with PIC16F505
  Posted by perdrix on 17 Mar, 2019 17:36
• If I insert a programmed 16C505 into a programmer and read it, can I then write the image to a PIC16F505 and just plug it into the existing circuit?
  
  Would I be correct in thinking that if I try to read a protected 16C505 I will get a nastygram from my programmer?
  
  Thanks
  David
• #1 Reply
  Posted by Niklas on 18 Mar, 2019 08:17
• Not sure that you will get any warnings if the part is read protected. The easiest way to find out is to check the hex file read from the part and see if the address range 0x0000 to 0x00FF contains anything else than 00 or FF.
• #2 Reply
  Posted by perdrix on 18 Mar, 2019 10:08
• No its not zero or FF.   So I *think* it read OK.  However still want to know if I can replace with PIC16F505.
  
  Thanks
• #3 Reply
  Posted by up8051 on 18 Mar, 2019 11:53
• Show the sample of readed data.
  Did you copy configuration bits?
• #4 Reply
  Posted by perdrix on 18 Mar, 2019 12:10
• Quote from: up8051 on 18 Mar, 2019 11:53

  Show the sample of readed data.
  Did you copy configuration bits?
  

  
  Data: Intel hex format
  

  Code: [Select]

  :100000002500090C24000A0C0A09A304A50B84018D
:100010006000A40284011F0E4307070A0008FF0FB7
:10002000FF0FFF0FFF0FFF0FFF0FFF0FFF0FFF0F60
:10003000FF0FFF0FFF0FFF0FFF0FFF0FFF0FFF0F50
:10004000FF0FFF0FFF0FFF0FFF0FFF0FFF0FFF0F40
:10005000FF0FFF0FFF0FFF0FFF0FFF0FFF0FFF0F30
:10006000FF0FFF0FFF0FFF0FFF0FFF0FFF0FFF0F20
:10007000FF0FFF0FFF0FFF0FFF0FFF0FFF0FFF0F10
:100080000000000000000000000000000000000070
:100090000000000000000000000000000000000060

Config bits - Dunno - just told the rommer to read the IC
• #5 Reply
  Posted by perdrix on 18 Mar, 2019 14:16
• I think that this may be a non starter as the config word is 0400 AFAICT which I think says "Write Protected" and "INTRC Osc/GP4"
  
  All memory from x'80' to x'7ff' is read as zeros
  
  Dave
• #6 Reply
  Posted by up8051 on 18 Mar, 2019 19:22
• It is protected.
  
  From datasheet:
  7.10 Program Verification/Code Protection
  If  the  code  protection  bit  has  not  been  programmed,the  on-chip  program  memory  can  be  read  out  forverification purposes.
  The first 64 locations and the last location (OSCCAL)can  be  read,  regardless  of  the  code  protection  bit setting.