PIC16F737-I Datasheet, PDF (53/276 Pages) Microchip Technology – 28/40/44-Pin, 8-Bit CMOS Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

PIC16F7X7
FIGURE 5-3:
BLOCK DIAGRAM OF RA2/AN2/VREF-/CVREF PIN
Data
Bus
WR
PORTA
WR
TRISA
D
Q
CK Q
Data Latch
D
Q
CK Q
TRIS Latch
VDD
P
N
VSS _Analog
Input Mode
RA2/AN2/VREF-/
CVREF pin
RD TRISA
RD PORTA
Q
D
EN
TTL
Input Buffer
To Comparator
To A/D Module VREF-
To A/D Module Channel Input
CVROE
CVREF
FIGURE 5-4:
BLOCK DIAGRAM OF RA4/T0CKI/C1OUT PIN
Data
Bus
WR
PORTA
WR
TRISA
D
Q
CK Q
Data Latch
D
Q
CK Q
TRIS Latch
Comparator Mode = 011, 101, 001
Comparator 1 Output
1
0
Analog
Input Mode
RD TRISA
N
VSS
Schmitt Trigger
Input Buffer
Q
D
RA4/T0CKI/
C1OUT pin
EN
RD PORTA
TMR0 Clock Input
 2004 Microchip Technology Inc.
DS30498C-page 51