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Thread: 16C76/CCS vs. 18C252/Hi-Tech
www.piclist.com/techref/microchip/devices.htm?key=16C
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face BY : Kosmerchock, Steve email (remove spam text)



Remember the 18CXXX series is 16 bits (2 bytes).
Not sure if this will help........

Steve

-----Original Message-----
From: embedded engineer [KILLspamembedded@spam@spam@spam@ELUCIT.COM]
Sent: Wednesday, November 15, 2000 3:42 PM
To: RemoveMEPICLIST.....spamMITVMA.MIT.EDU
Subject: [PIC]: 16C76/CCS vs. 18C252/Hi-Tech


After running out of ROM (and RAM) in the 16C76 I am trying the Hi-Tech
beta 18Cxxx compiler for a 18C252 target and am getting suprising
results.  With the 16C76 at near 100 percent I figure the ROM usage is
about 8k words or about 14k bytes at 14 bit words.  With the 18C252,
Hi-Tech reports "21194 bytes total Program ROM".

Of coarse I had to modify data types and write functions for those
provided by CCS.

I was expecting about the same ROM usage in bytes or maybe even a little
less with the 18C252.  I know this is kind of an apples and oranges
question but I am hoping someone here has similar experience.  Was I
expecting too much?   Will the non-beta version of Hi-Tech C produce
tighter code or is that just wishful thinking?  How could the 18C252
require so much more ROM for the same c code?

Regards,
David Koski

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