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| PIC16F818_13 Datasheet, PDF (46/178 Pages) Microchip Technology – 18/20-Pin Enhanced Flash Microcontrollers with nanoWatt Technology | |||
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PIC16F818/819
FIGURE 5-9:
BLOCK DIAGRAM OF RB1 PIN
I2C⢠Mode
Port/SSPEN Select
SDA Output
1
0
RBPU(2)
Data Bus
WR
PORTB
Data Latch
DQ
CK
WR
TRISB
TRIS Latch
DQ
CK Q
SDA Drive
RD TRISB
RD PORTB
SDA(3)
SDI
Schmitt Trigger
Buffer
VDD
P
Weak
Pull-up
VDD
P
N
I/O pin(1)
VSS
TTL
Input
Buffer
QD
EN
RD PORTB
Note 1: I/O pins have diode protection to VDD and VSS.
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 I2C specification.
DS39598F-page 46
ï£ 2001-2013 Microchip Technology Inc.
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