PIC16F819 Microchip Technology Inc., PIC16F819 Datasheet - Page 54

• Manufacturer Part Number: PIC16F819
• Description: 18/20-pin Enhanced Flash Microcontrollers With Nanowatt Technology
• Manufacturer: Microchip Technology Inc.

PIC16F818/819
FIGURE 5-15:
DS39598E-page 52
Note 1: I/O pins have diode protection to V
2: To enable weak pull-ups, set the appropriate TRIS bit(s) and clear the RBPU bit.
Port/Program Mode/ICD
PGD
RBPU
Data Bus
WR
PORTB
WR
TRISB
T1OSCEN
PGD DRVEN
Set RBIF
From other
RB7:RB4 pins
PGD
To T1OSI Input
BLOCK DIAGRAM OF RB7 PIN
(2)
RD PORTB
RD TRISB
TRIS Latch
Data Latch
D
D
CK
CK
Q
Q
DD
1
0
and V
SS
.
Input Mode
T1OSCEN
Input Buffer
1
0
Analog
Q
Q
Latch
EN
EN
TTL
D
D
RD PORTB
V
P
DD
 2004 Microchip Technology Inc.
Weak
Pull-up
I/O pin
Q1
Q3
(1)