PIC16F737-I Datasheet, PDF (65/276 Pages) Microchip Technology – 28/40/44-Pin, 8-Bit CMOS Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

FIGURE 5-15:
BLOCK DIAGRAM OF RB7/PGD PIN
Port/Program Mode/ICD
PGD
1
0
RBPU⁽¹⁾
Data Bus
WR PORTB
WR TRISB
Data Latch
DQ
CK
TRIS Latch
DQ
CK
RD TRISB
PGD DRVEN
PIC16F7X7
VDD
P
Weak
Pull-up
I/O pin
0
1
TTL
Input Buffer
Set RBIF
RD PORTB
From other
RB7:RB4 pins
PGD
Latch
QD
Program Mode/ICD
EN Q1
QD
EN
RD PORTB
Q3
Note 1: To enable weak pull-ups, set the appropriate TRIS bit(s) and clear the RBPU bit.
 2004 Microchip Technology Inc.
DS30498C-page 63