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Can't access all of 16F688's RAM

 
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ckrusen



Joined: 09 Feb 2009
Posts: 12

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Can't access all of 16F688's RAM
PostPosted: Wed Jul 29, 2009 10:54 am     Reply with quote
Device: PIC16F688 RAM
Compiler: CCSC PCM V3.235

The PIC16F688 has 256 bytes of RAM, and according to the datasheet the RAM occupies the spaces: $20-$7F, $90-$EF, and $120-$16F. That adds up to 256 bytes.

However, the compiler complains that I've used 100% of the RAM, while the SYM file shows no variables (declared or SCRATCH) above $EF.

How do I specify the memory space so I can use those last 80 bytes fro $120 - $16F?

Thanks in advance
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Calvin
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Jul 29, 2009 11:12 am     Reply with quote
Quote:

How do I specify the memory space so I can use those last 80 bytes fro $120 - $16F?

Quote:
#include <16F688.h>
#device *=16
#fuses XT, NOWDT, PUT, BROWNOUT
#use delay(clock=4000000)

Add the line shown in bold. This is for the 16F-series. It's not needed for 18F.
ckrusen



Joined: 09 Feb 2009
Posts: 12

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PostPosted: Wed Jul 29, 2009 11:37 am     Reply with quote
PCM programmer wrote:
Quote:

How do I specify the memory space so I can use those last 80 bytes fro $120 - $16F?

Quote:
#include <16F688.h>
#device *=16
#fuses XT, NOWDT, PUT, BROWNOUT
#use delay(clock=4000000)

Add the line shown in bold. This is for the 16F-series. It's not needed for 18F.


Thanks!

It seems odd to default to excluding nearly 1/3 of the RAM.
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Calvin
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Jul 29, 2009 11:48 am     Reply with quote
Quote:
It seems odd to default to excluding nearly 1/3 of the RAM.

See this thread for an explanation:
http://www.ccsinfo.com/forum/viewtopic.php?t=39538
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