BTW

http://www.piclist.com/techref/piclist/jinxlcdregmon.htm

A timing oversight - I found that a 48MHz USB PIC needs a
few NOPs in the transmit routine (as offered above) to give the
2520 a chance to store incoming and get back to data pick-up

The transmit routine could also of course include FSRs and
program/EEPROM locations

Generally now I have a pushbutton in the main loop or other
convenient wait place to send data on demand, using the bbdata
line as both button press detect and data transmit

Or the routine p2p is called to skip the button press and delay

(this example for an 8MHz 18F1320)

pic2pic  btfss   showram      ;wait for button release
         bra     $-2
         call    ms50         ;short debounce delay
         movlw   b'00101000'  ;i/p off, bbdata o/p on
         movwf   trisa

p2p      lfsr    fsr0,0x0000

d_loop   movlw   0x08
         movwf   temp4
         movf    indf0,w
         movwf   temp1
         call    send_d
         incfsz  fsr0l
         bra     d_loop
         movlw   b'10101000'  ;i/p on, bbdata o/p off
         movwf   trisa
         return

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