PIC16F87 Datasheet, PDF (61/214 Pages) Microchip Technology – 18/20/28-Pin Enhanced FLASH Microcontrollers with nanoWatt Technology

PIC16F87/88
FIGURE 5-8:
BLOCK DIAGRAM OF RB0 PIN
CCP1<M3:M0> = 1000, 1001, 11xx and CCPMX = 1
CCP
0
CCP1<M3:M0> = 000
1
RBPU⁽²⁾
Data Bus
WR PORTB
WR TRISB
Data Latch
DQ
CK
TRIS Latch
DQ
CK
VDD
P
Weak
Pull-up
I/O pin⁽¹⁾
TTL
Input
Buffer
RD TRISB
RD PORTB
QD
EN
To INT0 or CCP
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.
 2003 Microchip Technology Inc.
Preliminary
DS30487B-page 59