PIC16F818_13 Datasheet, PDF (41/178 Pages) Microchip Technology – 18/20-Pin Enhanced Flash Microcontrollers with nanoWatt Technology

PIC16F818/819
FIGURE 5-5:
MCLR Circuit
BLOCK DIAGRAM OF RA5/MCLR/VPP PIN
MCLRE
MCLR Filter
Schmitt Trigger
Buffer
Data
Bus
RD Port
RD TRIS ^VSS
Schmitt Trigger
Input Buffer
Q
D
EN
MCLRE
RA5/MCLR/VPP
VSS
FIGURE 5-6:
BLOCK DIAGRAM OF RA6/OSC2/CLKO PIN
CLKO (FOSC/4)
From OSC1 _Oscillator
Circuit
VDD
P
(FOSC = 1x1)
N
Data
Bus
WR
PORTA
D
Q
CK ^Q
Data Latch
VSS
VDD
P
D
Q
WR
TRISA
N
CK Q
(FOSC = 1x0,011)
TRIS Latch
VSS
RD TRISA
Q
D
EN
RD PORTA
Schmitt Trigger
Input Buffer
(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.
 2001-2013 Microchip Technology Inc.
VDD
RA6/OSC2/CLKO
VSS
DS39598F-page 41