PIC16F819 Microchip Technology Inc., PIC16F819 Datasheet - Page 53

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

FIGURE 5-14:
 2004 Microchip Technology Inc.
Note 1: I/O pins have diode protection to V
RBPU
Data Bus
WR
PORTB
WR
TRISB
T1OSCEN/ICD/
Program Mode
T1CKI/PGC
From T1OSO Output
2: To enable weak pull-ups, set the appropriate TRIS bit(s) and clear the RBPU bit.
BLOCK DIAGRAM OF RB6 PIN
Set RBIF
From other
RB7:RB4 pins
(2)
RD PORTB
TRIS Latch
RD TRISB
Data Latch
D
D
CK
CK
Q
Q
DD
and V
SS
.
Input Buffer
T1OSCEN
Q
Q
Latch
EN
EN
D
PIC16F818/819
D
TTL
RD PORTB
V
P
DD
Weak
Pull-up
I/O pin
Q1
Q3
(1)
DS39598E-page 51