PIC16F946 Datasheet, PDF (44/274 Pages) Microchip Technology – 64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt Technology

PIC16F946
3.3.3.5 RB4/COM0
Figure 3-10 shows the diagram for this pin. The
RB4/COM0 pin is configurable to function as one of the
following:
• a general purpose I/O
• an analog output for the LCD
FIGURE 3-10:
BLOCK DIAGRAM OF RB4/COM0
RBPU⁽¹⁾
Data Bus
WR PORTB
WR TRISB
D
Q
CK
Data Latch
D
Q
CK
TRIS Latch
LCDEN
RD TRISB
LCDEN
VDD
P
Weak
Pull-up
VDD
I/O Pin
TTL
Input Buffer
Set RBIF
RD PORTB
LCDEN
From other
RB<7:4> pins
COM0
LCDEN
Q
D
EN
Q
D
EN
RD PORTB
FOSC/4
Note 1: To enable weak pull-ups, set the appropriate TRIS bit(s) and clear the RBPU bit.
DS41265A-page 42
Preliminary
© 2005 Microchip Technology Inc.