Using the memory of the program for PIC16F54

[Maciek]

Hi all,
Whether for the PIC16F54 processor I can apply the declaration of tables in the memory of the program and next use this data like in the demonstration program.
The program is being compiled without the mistake, but I can't see in MPLAB of this data in the View->Program Memory window.

Code:

#include <16F54.h> #fuses XT,NOWDT,NOPROTECT #use delay(clock=4000000) #include <ctype.h> BYTE CONST TABLE1 [20]= {125,125,124,124,123,123,122,121,120,119,118,116,114,110,107,103,97,89,78,55}; void main() {       ------------------------------         f_sieci = TABLE1[7];       ------------------------------   }

[Ttelmah]

The data won't be visible. It'll be a program!.
On the 16 chips in general, you can't perform a 'read' of the program memory. So data tables are stored as a program, comprising a table of RETLW instructions, which is called to get the right number. The 'index' is added to the address of the start of the table, and the processor jumps to the line returning the required number. It works, but makes the values stored, differ from the declared numbers.

Best Wishes

[PCM programmer]

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