PIC16F628-20P Datasheet, PDF (38/170 Pages) Microchip Technology – FLASH-Based 8-Bit CMOS Microcontroller

PIC16F62X
FIGURE 5-10:
BLOCK DIAGRAM OF
RB2/TX/CK PIN
RBPU
PORT/PERIPHERAL Select⁽¹⁾
VDD
Weak
P ^Pull-up
VDD
USART TX/CK Output
0
Data Bus
WR PORTB
DQ
1
CK Q
Data Latch
DQ
RB2/
TX/CK
VSS
WR TRISB
Peripheral OE⁽²⁾
CK Q
TRIS Latch
RD TRISB
Q
TTL
Input
Buffer
D
EN
RD PORTB
USART Slave Clock In
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.
FIGURE 5-11:
BLOCK DIAGRAM OF
RB3/CCP1 PIN
RBPU
PORT/PERIPHERAL Select⁽¹⁾
VDD
Weak
P ^Pull-up
VDD
USART TX/CK output
0
Data Bus
WR PORTB
DQ
1
CK Q
Data Latch
DQ
RB3/
CCP1
VSS
WR TRISB
Peripheral OE⁽²⁾
CK Q
TRIS Latch
RD TRISB
Q
TTL
Input
Buffer
D
EN
RD PORTB
USART Slave Clock In
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.
DS40300C-page 36
Preliminary
 2003 Microchip Technology Inc.