PIC16F946 Datasheet, PDF (35/274 Pages) Microchip Technology – 64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt Technology

PIC16F946
3.1.1.5 RA4/C1OUT/T0CKI/SEG4
Figure 3-5 shows the diagram for this pin. The
RA4/C1OUT/T0CKI/SEG4 pin is configurable to
function as one of the following:
• a general purpose I/O
• a digital output from Comparator 1
• a clock input for TMR0
• an analog output for the LCD
FIGURE 3-5:
BLOCK DIAGRAM OF RA4/C1OUT/T0CKI/SEG4
Data Bus
WR PORTA
WR TRISA
CM<2:0> = 110 or 101
C1OUT
1
D
Q
0
VDD
CK Q
Data Latch
D
Q
CK Q
TRIS Latch
RD TRISA
VSS
SE4 and LCDEN
Analog Input or
SE4 and LCDEN
TTL
Input Buffer
I/O Pin
RD PORTA
T0CKI
SEG4
SE4 and LCDEN
Schmitt
Trigger
SE4 and LCDEN
© 2005 Microchip Technology Inc.
Preliminary
DS41265A-page 33