Datasheet

PIC16F913/914/916/917/946
DS41250F-page 48 © 2007 Microchip Technology Inc.
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
QD
Q
CK
Data Latch
TRIS Latch
RD TRISA
RD PORTA
QD
Q
CK
TTL
Input Buffer
To A/D Converter and Comparator
COM3
(1)
or SEG15
Data Bus
WR PORTA
WR TRISA
To A/ D M o d u l e 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.
Q
Q
LCDMODE_EN
(2)
Analog Input or
I/O Pin
LCDMODE_EN
(2)
LCDMODE_EN
(2)
VDD
VSS