At 09:04 PM 30/07/01 -0600, you wrote:
>I am working on a project using a 16F877 and am having difficulty in
>indirectly addressing RAM locations.  I would like to send a byte of data
>to RAM location 0x120, by using the following:
>
>movfw Offset                            ;contains the value 20h
>movwf FSR
>movfw Data1
>bcf STATUS,RP0
>bsf STATUS,RP1
>movwf INDF
>
>YET...when simulated, Data1 is moved to 0x020.
>It seems that no matter which page I switch to prior to executing the
>movwf INDF statement, Data1 is placed into 0x020.
>Can anyone help?

You need to use IRP for the FSR page (not RP0 & RP1)
The FSR covers 2 ram banks at a time (0/1 OR 2/3)
Try the following code: (should be right)

movf    offset,w                ;get the offset into w
bsf     status,irp      ;take fsr pointer into banks 2/3
movwf   fsr             ;point to 'offset' in bank 2
movf    data1,w         ;get the data to save into w
movwf   indf            ;and put it where the fsr is pointing to
bcf     status,irp      ;bring fsr pointer back into banks 0/1

Regards...

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