Datasheet

PIC16F631/677/685/687/689/690
DS40001262F-page 72  2005-2015 Microchip Technology Inc.
4.4.3.4 RB7/TX/CK
Figure 4-10 shows the diagram for this pin. The RB7/
TX/CK
(1)
pin is configurable to function as one of the
following:
• a general purpose I/O
• an asynchronous serial output
• a synchronous clock I/O
FIGURE 4-10: BLOCK DIAGRAM OF RB7
Note 1: TX and CK are available on PIC16F687/
PIC16F689/PIC16F690 only.
I/O Pin
VDD
VSS
D
Q
CK
Q
D
Q
CK
Q
D
Q
CK
Q
D
Q
CK
Q
VDD
D
EN
Q
D
EN
Q
Weak
Data Bus
WR
WPUB
RD
WPUB
RD PORTB
RD
PORTB
WR
PORTB
WR
TRISB
RD
TRISB
WR
IOCB
RD
IOCB
Interrupt-on-
RABPU
Change
Q3
SPEN
TXEN
CK
TX
SYNC
EUSART
EUSART
0
1
1
0
0
1
1
0
Available on PIC16F687/PIC16F689/PIC16F690 only.
0
1
1
0
‘1’