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| PIC16F87 Datasheet, PDF (67/214 Pages) Microchip Technology – 18/20/28-Pin Enhanced FLASH Microcontrollers with nanoWatt Technology | |||
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FIGURE 5-14:
BLOCK DIAGRAM OF RB6 PIN
Analog
Input Mode
RBPU(2)
Data Bus
WR PORTB
WR TRISB
Data Latch
DQ
CK
TRIS Latch
DQ
CK
T1OSCEN/ICD/PROG
Mode
RD TRISB
PIC16F87/88
VDD
P
Weak
Pull-up
I/O pin(1)
Analog
Input Mode
TTL
Input Buffer
Set RBIF
RD PORTB
From other
RB7:RB4 pins
PGC/T1CKI
From T1OSCO Output
To A/D Module Channel Input (PIC16F88 only)
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.
 2003 Microchip Technology Inc.
Preliminary
DS30487B-page 65
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