PIC16F913/914/916/917/946
3.2.1.4
RA3/AN3/C1+/VREF+/COM3/SEG15
Figure 3-4 shows the diagram for this pin. The RA3 pin
is configurable to function as one of the following:
• a general purpose input
• an analog input for the ADC
• an analog input from Comparator C1
• a voltage reference input for the ADC
• analog outputs for the LCD
FIGURE 3-4:
BLOCK DIAGRAM OF RA3
Data Bus
D
Q
Q
VDD
VSS
WR PORTA
CK
Data Latch
Q
D
I/O Pin
WR TRISA
CK
Q
TRIS Latch
Analog Input or
LCDMODE_EN(2)
TTL
Input Buffer
LCDMODE_EN(2)
RD TRISA
RD PORTA
LCDMODE_EN(2)
COM3(1) or SEG15
To A/D Converter and Comparator
To A/D Module VREF+ Input
Note 1: PIC16F913/916 only.
2: For the PIC16F913/916, the LCDMODE_EN = LCDEN and (SE15 or LMUX<1:0> = 11).
For the PIC16F914/917 and PIC16F946, the LCDMODE_EN = LCDEN and SE15.
DS41250F-page 48
© 2007 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
