PIC18F1220_07 Datasheet, PDF (94/308 Pages) Microchip Technology – 18/20/28-Pin High-Performance, Enhanced Flash Microcontrollers with 10-bit A/D and nanoWatt Technology

PIC18F1220/1320
FIGURE 10-9:
BLOCK DIAGRAM OF RB2/P1B/INT2 PIN
RBPU⁽²⁾
P1B Enable
P1B Data
P1B/D Tri-State
1
Auto-Shutdown
0
Data Bus
WR LATB or
PORTB
WR TRISB
Data Latch
DQ
CK
TRIS Latch
DQ
CK
RD TRISB
RD LATB
RD PORTB
VDD
P
Weak
Pull-up
TTL
Input
Buffer
RB2 pin⁽¹⁾
Q
D
EN
INT2 Input
Schmitt
Trigger
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 (INTCON2<7>).
DS39605F-page 92
© 2007 Microchip Technology Inc.