PIC16F628-20P Datasheet, PDF (32/170 Pages) Microchip Technology – FLASH-Based 8-Bit CMOS Microcontroller

PIC16F62X
FIGURE 5-1:
BLOCK DIAGRAM OF
RA0/AN0:RA1/AN1 PINS
Data
Bus
D
Q
VDD
WR
PORTA
CK Q
Data Latch
WR
TRISA
D
Q
CK Q
TRIS Latch
I/O Pin
VSS
Analog
Input Mode
RD
TRISA
Schmitt Trigger
Input Buffer
RD PORTA
To Comparator
Q
D
EN
FIGURE 5-2:
BLOCK DIAGRAM OF
RA2/VREF PIN
Data
Bus
D
Q
VDD
WR
PORTA
CK Q
Data Latch
WR
TRISA
D
Q
CK Q
TRIS Latch
Analog
Input Mode
RA2 Pin
VSS
RD
TRISA
Schmitt Trigger
Input Buffer
Q
D
EN
RD PORTA
To Comparator
VROE
VREF
FIGURE 5-3:
BLOCK DIAGRAM OF THE RA3/AN3 PIN
Data
Bus
WR
PORTA
D
Q
CK Q
Data Latch
Comparator Mode = 110
Comparator Output
1
0
D
Q
WR
TRISA
CK Q
TRIS Latch
RD
TRISA
Q
Analog
Input Mode
Schmitt Trigger
Input Buffer
D
EN
RD PORTA
To Comparator
VDD
RA3 Pin
VSS
DS40300C-page 30
Preliminary
 2003 Microchip Technology Inc.