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| PIC16F87 Datasheet, PDF (66/214 Pages) Microchip Technology – 18/20/28-Pin Enhanced FLASH Microcontrollers with nanoWatt Technology | |||
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PIC16F87/88
FIGURE 5-13:
BLOCK DIAGRAM OF RB5 PIN
RBPU(2)
PORT/SSPEN
Data Bus
WR
PORTB
WR
TRISB
Data Latch
DQ
CK
TRIS Latch
DQ
CK
RD TRISB
Set RBIF
RD PORTB
From Other
RB7:RB4 pins
SS/TX/CK
VDD
P
Weak
Pull-up
I/O pin(1)
TTL
Input
Buffer
Latch
QD
EN
Q1
Q
D
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.
DS30487B-page 64
Preliminary
 2003 Microchip Technology Inc.
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