PIC16F627A Datasheet, PDF (39/168 Pages) Microchip Technology – FLASH-Based 8-Bit CMOS Microcontrollers

PIC16F627A/628A/648A
FIGURE 5-8:
RBPU
BLOCK DIAGRAM OF
RB0/INT PIN
VDD
P Weak Pull-up
VDD
Data Bus
WR PORTB
D
Q
CK Q
Data Latch
RB0/INT
VSS
WR TRISB
D
Q
CK Q
TRIS Latch
RD TRISB
RD PORTB
INT
TTL
Input
Buffer
Q
D
EENN
Schmitt
Trigger
FIGURE 5-9:
RBPU
SPEN
BLOCK DIAGRAM OF
RB1/RX/DT PIN
VDD
Weak
P ^Pull-up
VDD
USART Data Output
1
Data Bus
WR PORTB
DQ
0
CK Q
Data Latch
DQ
RB1/
RX/DT
VSS
WR TRISB
Peripheral OE⁽¹⁾
CK Q
TRIS Latch
RD TRISB
TTL
Input
Buffer
Q
D
EN
RD PORTB
USART Receive Input
Schmitt
Trigger
Note 1: Peripheral OE (output enable) is only active if
peripheral select is active.
 2002 Microchip Technology Inc.
Preliminary
DS40044A-page 37