PIC16F628-20P Datasheet, PDF (37/170 Pages) Microchip Technology – FLASH-Based 8-Bit CMOS Microcontroller

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
PIC16F62X
FIGURE 5-9:
BLOCK DIAGRAM OF
RB1/RX/DT PIN
RBPU
PORT/PERIPHERAL Select⁽¹⁾
VDD
Weak
P ^Pull-up
VDD
USART Data Output
0
Data Bus
WR PORTB
DQ
1
CK Q
Data Latch
DQ
RB1/
RX/DT
VSS
WR TRISB
Peripheral OE⁽²⁾
CK Q
TRIS Latch
RD TRISB
TTL
Input
Buffer
Q
D
EN
RD PORTB
USART Receive Input
Schmitt
Trigger
Note
1: Port/Peripheral select signal selects between port
data and peripheral output.
2: Peripheral OE (output enable) is only active if
peripheral select is active.
 2003 Microchip Technology Inc.
Preliminary
DS40300C-page 35