PIC16F819 Microchip Technology Inc., PIC16F819 Datasheet - Page 51

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

FIGURE 5-12:
 2004 Microchip Technology Inc.
Note 1: I/O pins have diode protection to V
Port/SSPEN
SCK/SCL
RBPU
Data Bus
WR
PORTB
WR
TRISB
Set RBIF
From other
RB7:RB4 pins
SCK
SCL
(3)
BLOCK DIAGRAM OF RB4 PIN
2: To enable weak pull-ups, set the appropriate TRIS bit(s) and clear the RBPU bit.
3: The SCL Schmitt Trigger conforms to the I
(2)
RD PORTB
TRIS Latch
RD TRISB
Data Latch
D
D
CK
CK
Q
Q
1
0
SCL Drive
DD
and V
2
C™ specification.
SS
.
Q
Q
Latch
V
P
V
N
PIC16F818/819
DD
SS
EN
EN
D
D
TTL
Input
Buffer
RD PORTB
V
P
DD
I/O pin
Weak
Pull-up
Q1
Q3
(1)
DS39598E-page 49