MPLAB Bug solved
The MPLAB IDE 8.20 Watch window does not display RB7 of PORTB GPR.
Microchip IS aware of it and in MPLAB IDE 8.30 this problem is corrected.
DS39598E Page 52 Figure 5-15 is incorrect. It shows RB7 as being partly controlled by an Analog Input Mode at the TTL Buffer at the right center of the figure. Microchip IS aware of this error which is contained in the PIC16F818/819 datasheet. This may not be the only datasheet that has this error.
Bill Harris-Riverside, CA