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