PIC16F946 Datasheet, PDF (31/274 Pages) Microchip Technology – 64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt Technology

PIC16F946
3.1.1
PIN DESCRIPTIONS AND
DIAGRAMS
Each PORTA pin is multiplexed with other functions. The
pins and their combined functions are briefly described
here. For specific information about individual functions,
refer to the appropriate section in this data sheet.
3.1.1.1 RA0/AN0/C1-/SEG12
Figure 3-1 shows the diagram for this pin. The
RA0/AN0/C1-/SEG12 pin is configurable to function as
one of the following:
• a general purpose I/O
• an analog input for the A/D
• an analog input for Comparator 1
• an analog output for the LCD
FIGURE 3-1:
BLOCK DIAGRAM OF RA0/AN0/C1-/SEG12
Data Bus
WR PORTA
WR TRISA
D
Q
CK Q
Data Latch
D
Q
CK Q
TRIS Latch
RD TRISA
VDD
I/O Pin
Analog Input or
SE12 and LCDEN
SE12 and LCDEN
TTL
Input Buffer
RD PORTA
SEG12
SE12 and LCDEN
To A/D Converter or Comparator
© 2005 Microchip Technology Inc.
Preliminary
DS41265A-page 29