Okay.

So I modified the code as this:
Code:
<html><head></head><body><!--StartFragment--><pre><code><font color="#000080"><i>' PIC16F630 Fuses
</i></font><font color="#008000">@ DEVICE WDT_ON

</font><font color="#000080"><i>'-------------------------------------------------------------------------------
' Registers   76543210
</i></font>WPUA       = %00110100 <font color="#000080"><i>'Weak Pull-up of PORTA for SCL and SDA on DS1307
</i></font>TRISA      = %00000100 <font color="#000080"><i>'Set Input/Output

'-------------------------------------------------------------------------------
' Variables
</i></font>DSOut    <b>VAR </b>PORTA.2 <font color="#000080"><i>'DS1307 SQW pin #7

'-------------------------------------------------------------------------------
</i></font>MAIN:
<b>IF </b>DSOut = 0 <b>THEN
   GOSUB </b>Read_1307  <font color="#000080"><i>'Read the time &amp; date
   </i></font><b>GOSUB </b>lcd
   <font color="#000080"><i>'put PIC in low-power mode for 576+288+72=936ms
   </i></font><b>NAP </b>5
   <b>NAP </b>4
   <b>NAP </b>2
<b>ENDIF
GOTO </b>MAIN:
<b>END
</b></code></pre><!--EndFragment--></body>
</html>
Maybe it doesn't make a lot of sense to put the PIC in low-power mode. How is it done in the "industrial" life?