PIC16F684T-E Datasheet, PDF (40/192 Pages) Microchip Technology – 14-Pin, Flash-Based 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F684
4.2.5.6 RA5/T1CKI/OSC1/CLKIN
Figure 4-6 shows the diagram for this pin. The RA5 pin
is configurable to function as one of the following:
• a general purpose I/O
• a Timer1 clock input
• a crystal/resonator connection
• a clock input
FIGURE 4-6:
BLOCK DIAGRAM OF RA5
Data Bus
DQ
WR
WPUA
CK _Q
RD
WPUA
DQ
WR
PORTA
CK _Q
WR
TRISA
DQ
CK _Q
RD
TRISA
RD
PORTA
DQ
WR
IOCA
CK _Q
RD
IOCA
Interrupt-on-
Change
To Timer1
INTOSC
Mode
TMR1LPEN⁽¹⁾
VDD
Weak
RAPU
Oscillator
Circuit
OSC2
VDD
INTOSC
Mode
I/O Pin
VSS
QD
EN
Q3
QD
EN
RD PORTA
Note 1: Timer1 LP Oscillator enabled.
DS41202F-page 38
© 2007 Microchip Technology Inc.