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16F505 have same RAM like 12F509

 
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nailuy



Joined: 21 Sep 2010
Posts: 159

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16F505 have same RAM like 12F509
PostPosted: Tue Nov 04, 2014 7:19 am     Reply with quote

Hy
I have compiler 4.140
I make program for PIC12F509, after I see not enought no of pins I changed for PIC16F505 and on compiler RAM used is the same 89%, but on data sheet I see 509 have 41 SRAM bytes, and 505 have 72 SRAM bytes.
When I change controllers RAM used must fall to about 51%? for same program?
509 have 2 Bank of registers
505 have 4 Bank of registers (but compiler use only 2 I think)
I look froward for your help.
Best regards.
Ttelmah



Joined: 11 Mar 2010
Posts: 19538

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PostPosted: Tue Nov 04, 2014 9:29 am     Reply with quote

#DEVICE *=8

By default the compiler saves space in the code, by only using 5bit RAM addresses. Makes the code smaller (reduces bank switching) but limits you on how much RAM can be accessed.
nailuy



Joined: 21 Sep 2010
Posts: 159

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PostPosted: Tue Nov 04, 2014 4:11 pm     Reply with quote

Yes Ttelmah you are right.
Thank you.
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