PIC16F819 Microchip Technology Inc., PIC16F819 Datasheet - Page 48

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

PIC16F818/819
FIGURE 5-9:
DS39598E-page 46
Note 1: I/O pins have diode protection to V
I
Port/SSPEN Select
SDA Output
RBPU
Data Bus
WR
PORTB
WR
TRISB
SDA Drive
SDA
SDI
2
C™ Mode
2: To enable weak pull-ups, set the appropriate TRIS bit(s) and clear the RBPU bit.
3: The SDA Schmitt Trigger conforms to the I
BLOCK DIAGRAM OF RB1 PIN
(3)
(2)
RD PORTB
TRIS Latch
Data Latch
D
D
CK
CK
Schmitt Trigger
Buffer
RD TRISB
Q
Q
Q
1
0
DD
and V
2
C specification.
SS
.
Q
EN
RD PORTB
TTL
Input
Buffer
D
V
P
N
V
DD
SS
V
P
 2004 Microchip Technology Inc.
DD
Weak
Pull-up
I/O pin
(1)