PIC16F87 Datasheet, PDF (58/214 Pages) Microchip Technology – 18/20/28-Pin Enhanced FLASH Microcontrollers with nanoWatt Technology

PIC16F87/88
FIGURE 5-7:
BLOCK DIAGRAM OF RA7/OSC1/CLKI PIN
From OSC2
Oscillator
Circuit
Data
Bus
WR
PORTA
WR
TRISA
D
Q
CK ^Q
Data Latch
D
Q
CK Q
TRIS Latch
(FOSC = 011)
VDD
P
N
FOSC = 10x
VSS
RD TRISA
Q
D
Schmitt Trigger
Input Buffer
RD PORTA
EN
FOSC = 10x
Note 1: I/O pins have protection diodes to VDD and VSS.
VDD
RA7/OSC1/CLKI pin⁽¹⁾
VSS
DS30487B-page 56
Preliminary
 2003 Microchip Technology Inc.