Datasheet

PIC16F87/88
DS30487D-page 54  2002-2013 Microchip Technology Inc.
FIGURE 5-4: BLOCK DIAGRAM OF RA4/AN4/T0CKI/C2OUT PIN
FIGURE 5-5: BLOCK DIAGRAM OF RA5/MCLR
/VPP PIN
Data
Bus
QD
Q
CK
N
WR
PORTA
WR
TRISA
Data Latch
TRIS Latch
RD TRISA
RD PORTA
V
SS
RA4 pin
DQ
EN
TMR0 Clock Input
Schmitt Trigger
Input Buffer
Comparator 2 Output
Comparator Mode = 011, 101, 110
1
0
VDD
Analog
Input Mode
To A/D Module Channel Input (PIC16F88 only)
P
VDD
QD
Q
CK
DQ
EN
MCLR Filter
RA5/MCLR/VPP pin
RD Port
MCLR Circuit
MCLRE
MCLRE
Data Bus
RD TRIS
Schmitt Trigger
Buffer
VSS
VSS
Schmitt Trigger
Input Buffer