PIC16F627A_05 Datasheet, PDF (44/180 Pages) Microchip Technology – Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F627A/628A/648A
FIGURE 5-15:
RBPU
BLOCK DIAGRAM OF THE RB7/T1OSI/PGD PIN
VDD
P ^{weak pull-up}
To RB6
Data Bus
WR PORTB
WR TRISB
D
Q
CK Q
Data Latch
D
Q
CK Q
TRIS Latch
TMR1 oscillator
VDD
RB7/T1OSI/
PGD pin
VSS
RD TRISB
T10SCEN
RD PORTB
Serial Programming Input
Set RBIF
From other
RB<7:4> pins
Q
D
EN
Schmitt
Trigger
Q
D
EN
TTL
input
buffer
Q1
Q3
DS40044D-page 42
© 2005 Microchip Technology Inc.