Datasheet

PIC16F627A/628A/648A
DS40044G-page 36 © 2009 Microchip Technology Inc.
FIGURE 5-7: BLOCK DIAGRAM OF RA7/OSC1/CLKIN PIN
Data Bus
QD
Q
CK
WR PORTA
WR TRISA
Data Latch
TRIS Latch
RD TRISA
RD PORTA
RA7/OSC1/CLKIN Pin
Q
D
Q
CK
DQ
EN
To Clock Circuits
F
OSC = 100, 101
(1)
VDD
VSS
Note 1: INTOSC with CLKOUT and INTOSC with I/O.
Schmitt Trigger
Input Buffer