PIC18F2220/2320/4220/4320
DS39599G-page 102
2007 Microchip Technology Inc.
FIGURE 10-2:
BLOCK DIAGRAM OF
RA3:RA0 AND RA5 PINS
FIGURE 10-3:
BLOCK DIAGRAM OF
RA6 PIN
FIGURE 10-4:
BLOCK DIAGRAM OF
RA4/T0CKI PIN
FIGURE 10-5:
BLOCK DIAGRAM OF
RA7 PIN
Data
Bus
QD
EN
P
N
WR LATA
WR TRISA
Data Latch
TRIS Latch
RD TRISA
RD PORTA
VSS
VDD
I/O pin(1)
Note 1:
I/O pins have protection diodes to VDD and VSS.
Analog
Input
Mode
TTL
Input
Buffer
To A/D Converter and LVD Modules
RD LATA
or
PORTA
Q
D
Q
CK
Q
D
Q
CK
SS Input (RA5 only)
Data
Bus
Q
D
Q
CK
QD
EN
P
N
WR LATA
WR
Data Latch
TRIS Latch
RD
RD PORTA
VSS
VDD
I/O pin(1)
Note 1:
I/O pins have protection diodes to VDD and VSS.
or
PORTA
RD LATA
RA6 Enable
ECIO or
Enable
TTL
Input
Buffer
RCIO
TRISA
Q
D
Q
CK
TRISA
Data
Bus
WR TRISA
RD PORTA
Data Latch
TRIS Latch
Schmitt
Trigger
Input
Buffer
N
VSS
I/O pin(1)
TMR0 Clock Input
Q
D
Q
CK
Q
D
Q
CK
EN
QD
EN
RD LATA
WR LATA
or
PORTA
Note 1:
I/O pins have protection diodes to VDD and VSS.
RD TRISA
Data
Bus
Q
D
Q
CK
QD
EN
P
N
WR LATA
WR
Data Latch
TRIS Latch
RD
RD PORTA
VSS
VDD
I/O pin(1)
Note 1:
I/O pins have protection diodes to VDD and VSS.
or
PORTA
RD LATA
Enable
TTL
Input
Buffer
RA7
TRISA
Q
D
Q
CK
TRISA
RA7 Enable
To Oscillator
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