PIC16F627A_05 Datasheet, PDF (39/180 Pages) Microchip Technology – Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F627A/628A/648A
FIGURE 5-9:
RBPU
SPEN
BLOCK DIAGRAM OF
RB1/RX/DT PIN
VDD
Weak
P ^Pull-up
VDD
USART Data Output
1
Data Bus
DQ
0
WR PORTB
CK Q
Data Latch
DQ
RB1/
RX/DT
VSS
WR TRISB
Peripheral OE⁽¹⁾
CK Q
TRIS Latch
RD TRISB
Q
TTL
Input
Buffer
D
EN
RD PORTB
USART Receive Input
Schmitt
Trigger
Note 1: Peripheral OE (output enable) is only active if
peripheral select is active.
FIGURE 5-10:
RBPU
SPEN
BLOCK DIAGRAM OF
RB2/TX/CK PIN
VDD
Weak
P ^Pull-up
VDD
USART TX/CK Output
1
Data Bus
DQ
0
WR PORTB
CK Q
Data Latch
DQ
RB2/
TX/CK
VSS
WR TRISB
Peripheral OE⁽¹⁾
CK Q
TRIS Latch
RD TRISB
Q
TTL
Input
Buffer
D
EN
RD PORTB
USART Slave Clock In
Schmitt
Trigger
Note 1: Peripheral OE (output enable) is only active if
peripheral select is active.
© 2005 Microchip Technology Inc.
DS40044D-page 37