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| PIC16F87_05 Datasheet, PDF (65/228 Pages) Microchip Technology – 18/20/28-Pin Enhanced Flash Microcontrollers with nanoWatt Technology | |||
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PIC16F87/88
FIGURE 5-12:
BLOCK DIAGRAM OF RB4/SCK/SCL PIN
Port/SSPEN
SCK/SCL
1
0
RBPU(2)
Data Bus
WR
PORTB
WR
TRISB
Data Latch
DQ
CK
TRIS Latch
DQ
CK
RD TRISB
SCL Drive
Set RBIF
RD PORTB
From other
RB7:RB4 pins
SCK
SCL(3)
VDD
P
Weak
Pull-up
VDD
P
N
I/O pin(1)
VSS
TTL
Input
Buffer
Latch
QD
EN
Q1
QD
RD PORTB
EN
Q3
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 SCL Schmitt conforms to the I2C⢠specification.
 2005 Microchip Technology Inc.
DS30487C-page 63
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