PIC16F688 Datasheet, PDF (37/174 Pages) Microchip Technology – 14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

FIGURE 4-1:
BLOCK DIAGRAM OF RA0
PIC16F688
Data Bus
WR
WPUDA
RD
WPUDA
DQ
CK _Q
Analog⁽¹⁾
Input Mode
RAPU
VDD
Weak
VDD
WR
PORTA
DQ
CK _Q
I/O PIN
VSS
WR
TRISA
DQ
CK _Q
RD
TRISA
RD
PORTA
WR
IOCA
DQ
CK _Q
RD
IOCA
Interrupt-on-
Change
-
+
VT
Analog⁽¹⁾
Input Mode
01
IULP
Vss
ULPWUE
QD
EN
Q3
QD
EN
RD PORTA
To Comparator
To A/D Converter
Note 1: Comparator mode and ANSEL determines analog input mode.
 2004 Microchip Technology Inc.
Preliminary
DS41203B-page 35