Simulator and EECON1,WR

ibwev · Jul 20, 2011

I am troubleshooting a program using MPLAB Simulator. In the code, I am learning to work with EEPROM by writting data to it and then trying to read from it. When writting data to EEPROM, the write control bit of EECON1 correctly sets. However, it does not clear after the information is written. The 16F690 datasheet says it is cleared by hardware. Can a set Write Control Bit of EECON1 clear while using the MPLAB Simulator. If so, how?

Gayan Soyza · Jul 20, 2011

In simulator it does not clear.Never tried.

But in modern PIC's like 16F886 it still does not clear.You have to poll the EEIF bit for a write complete.

ibwev · Jul 21, 2011

Thanks for the response. How do I poll the EEIF bit for a write complete?

ericgibbs · Jul 21, 2011

ibwev said:
Thanks for the response. How do I poll the EEIF bit for a write complete?

hi,
This link has sample asm code.

ibwev · Jul 21, 2011

Great help. Polling the EEIF bit works in the MPLAB Simulator. I can now troubleshoot writes and reads in EEPROM.

Pommie · Jul 21, 2011

Gayan Soyza said:
But in modern PIC's like 16F886 it still does not clear.You have to poll the EEIF bit for a write complete.

Not according to the data sheet.

Mike.

Gayan Soyza · Jul 24, 2011

Mike I tried that WR bit in real life.But it never gets clear.So I poll the EEIF bit as shown in the 886 data sheet.

be80be · Jul 24, 2011

I think this shed some light in here

Interrupt flag bit EEIF

The user can either
enable this interrupt or poll this bit. EEIF must be
cleared by software.

Pommie · Jul 25, 2011

Just tried this and the WR bit does get cleared in the simulator.

Code (BoostC format) for any one to try,

Code:

#include <system.h>

#pragma DATA _CONFIG, _DEBUG_OFF & _MCLRE_ON
                    & _CP_OFF & _PWRTE_OFF
                    & _WDT_OFF & _INTOSCIO
                    & _LVP_OFF

#pragma CLOCK_FREQ 8000000


void main(void){
    osccon=0x71;            //8 meg
    ansel=0;
    anselh=0;

    eedata=0x23;
    eeadr=0;
    eecon1=0b0000100;

    eecon2=0x55;
    eecon2=0xaa;
    eecon1.WR=1;

    while(eecon1.WR);

    while(1){

    }//end while
}//end main

Edit, it will not work if you single step through the code as the required sequence doesn't get followed.

Mike.

Simulator and EECON1,WR

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