New PIC16 chips GPR memory org.

[Mosaic]

Hi all:
I read somewhere that the newer enhanced 16F PIC chips have a 'flat' memory organization (GPR) with no banking issues. Is this accurate?
Eg. 16F18857 or 16F1936

 

[Nigel Goodwin]

Not exactly - you can however access the memory in a fairly linear fashion by correctly setting the options.

I used a 16F1827 for exactly that reason, configured a linear buffer in the memory, downloaded GSM txt messages to it, and then searched the buffer to identify required strings.

 

[Mike - K8LH]

Hi all:
I read somewhere that the newer enhanced 16F PIC chips have a 'flat' memory organization (GPR) with no banking issues. Is this accurate?
Eg. 16F18857 or 16F1936

Do you need help finding the datasheets?

 

[Mosaic]

If u can point out the relevant section, mike, that would be helpful

 

[jpanhalt]

Here's a link to the migration document: http://ww1.microchip.com/downloads/en/DeviceDoc/41375A.pdf It gives more detail and examples.

John

 

[Mosaic]

John, can u advise on the FSR access to the 'linear' GPR being only 9FF bytes long?
The 16F18857 has 1000h bytes of GPR. How would these extra bytes be mirrored?

 

[jpanhalt]

Fortunately or unfortunately, depending on your point of view, I have never had to do that. I do find the much easier FSRx and tables a real boon. Also, the added instructions and direct access to WREG have been appreciated. The 12F1840 has replaced the 12F683 as my simple chip. I like the 16F1829 too. I have not gotten into the newest versions like the 16F18857. I am still wed to MPLab 8.92, so some new stuff is not available to me. I plan to change that in the future.

John

 

[Nigel Goodwin]

A quick glance at my old source code shows declaring the linear buffer using cblock.

cblock   0x2050                ;receive buffer starting in bank1
               Buff:Buff_Size   ;240 character receive buffer
endc