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PICList Thread
'Extended Microcontroller 17c42'
1996\04\26@040504 by Wolfram Liebchen

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Does anybody know, what happens to the port C, D and E registers
and to the respective direction registers, when the PIC 17c4x is used
in extended microcontroller mode or in microprocessor mode?
Can I use them as general purpose registers or are they changed through
the accesses to external RAM / ROM?

TIA

Wolfram


+-----------------------------------------------+
! Wolfram Liebchen, spam_OUTliebchenTakeThisOuTspamipserv.ffo.fgan.de !
!      Forschungsinstitut fuer Optik            !
!      Schloss Kressbach                        !
!      D-72072 Tuebingen                        !
!      Tel: +49 (0)7071 / 709-158               !
!      Fax: +49 (0)7071 / 709-270   (G3 / G4)   !
+-----------------------------------------------+

1996\04\26@180424 by Pete Brink

picon face
     Wolfram,

     I have not had any success in finding out whether you can or
     cannot use Ports C, D and E (and their associated direction
     registers) when in extended microcontroller mode.  I have a
     request in to the designer of the chip for an answer.  I did get
     one suggestion, however, if you really need more RAM you can use
     the PIC17C44 instead of the PIC17C42.

     I will let the list know when the answer comes in.

     Tchuess,

     Pete

     Pete Brink
     Senior Software Engineer
     Microchip Technology Inc.
     .....pete.brinkKILLspamspam@spam@microchip.com


______________________________ Reply Separator _________________________________
Subject: Extended Microcontroller 17c42
Author:  Wolfram Liebchen <liebchenspamKILLspamIPSERV.FFO.FGAN.DE> at Internet_Exchange
Date:    4/26/96 4:05 AM


Does anybody know, what happens to the port C, D and E registers
and to the respective direction registers, when the PIC 17c4x is used
in extended microcontroller mode or in microprocessor mode?
Can I use them as general purpose registers or are they changed through
the accesses to external RAM / ROM?

TIA

Wolfram


+-----------------------------------------------+
! Wolfram Liebchen, .....liebchenKILLspamspam.....ipserv.ffo.fgan.de !
!      Forschungsinstitut fuer Optik            !
!      Schloss Kressbach                        !
!      D-72072 Tuebingen                        !
!      Tel: +49 (0)7071 / 709-158               !
!      Fax: +49 (0)7071 / 709-270   (G3 / G4)   !
+-----------------------------------------------+

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