real time clock

[sayzer]

IF hour > 12 THEN

     IF Mode = am THEN
                Mode = pm
     ELSE
                Mode = am
     ENDIF
     
     hour = 1

ENDIF

Why don't you try this:

IF hour > 12 THEN
     TOGGLE Mode
     hour = 1
ENDIF

For the Bit7 and Bit5, I checked again, you are right. I apologize.

Say your Bit7 and Bit5 are set correctly.
The rest, Bit4,Bit3,Bit2,Bit1 and Bit0 are consisting your hour data (in AM mode). In PM mode, Bit5 is also consisting hour data.
You are setting the hour data the same each time.