PIC16F610 Datasheet, PDF (40/180 Pages) Microchip Technology – 14-Pin, Flash-Based 8-Bit CMOS Microcontrollers

PIC16F610/616/16HV610/616
4.2.4.6 RA5/T1CKI/OSC1/CLKIN
Figure 4-5 shows the diagram for this pin. The RA5 pin
is configurable to function as one of the following:
FIGURE 4-5:
BLOCK DIAGRAM OF RA5
• a general purpose I/O
• a Timer1 clock input
• a crystal/resonator connection
• a clock input
Data Bus
DQ
WR
WPUA
CK _Q
RD
WPUA
WR
PORTA
DQ
CK _Q
INTOSC
Mode TMR1LPEN⁽¹⁾
VDD
Weak
RAPU
Oscillator
Circuit
OSC2
VDD
WR
TRISA
DQ
CK _Q
RD
TRISA
INTOSC
Mode
I/O Pin
VSS
RD
PORTA
DQ
WR
IOCA
CK _Q
RD
IOCA
Interrupt-on-
Change
Q S⁽²⁾
R
Write ‘0’ to RAIF
From other
RA<4:0> pins
To Timer1
Note 1: Timer1 LP Oscillator enabled.
2: Set has priority over Reset.
QD
EN
Q1
QD
EN
RD PORTA
DS41288C-page 38
Preliminary
© 2007 Microchip Technology Inc.