PIC16F87-E Datasheet, PDF (57/228 Pages) Microchip Technology – 18/20/28-Pin Enhan lashMicrocontrollers with nanoWatt Technology

PIC16F87/88
FIGURE 5-6:
BLOCK DIAGRAM OF RA6/OSC2/CLKO PIN
CLKO (FOSC/4)
From OSC1 _Oscillator
Circuit
VDD
P
Data
Bus
WR
PORTA
(FOSC = 1x1)
D
Q
CK Q
Data Latch
N
VSS
VDD
P
D
Q
WR
N
TRISA
CK Q
(FOSC = 1x0, 011)
TRIS Latch
VSS
RD TRISA
Q
D
Schmitt Trigger
Input Buffer
RD PORTA
EN
(FOSC = 1x0, 011)
Note 1: I/O pins have protection diodes to VDD and VSS.
2: CLKO signal is 1/4 of the FOSC frequency.
VDD
RA6/OSC2/CLKO pin
VSS
 2005 Microchip Technology Inc.
DS30487C-page 55