PIC18F2220 Datasheet, PDF (104/388 Pages) Microchip Technology – 28/40/44-Pin High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

PIC18F2220/2320/4220/4320
FIGURE 10-2:
BLOCK DIAGRAM OF
RA3:RA0 AND RA5 PINS
RD LATA
Data
Bus
WR LATA
or
PORTA
WR TRISA
Analog
Input
Mode
DQ
CK Q
Data Latch
DQ
CK Q
TRIS Latch
VDD
P
N _{I/O pin}(1)
VSS
RD TRISA
Q
D
TTL
Input
Buffer
EN
RD PORTA
SS Input (RA5 only)
To A/D Converter and LVD Modules
Note 1: I/O pins have protection diodes to VDD and VSS.
FIGURE 10-3:
RA6 Enable
Data
Bus
RD LATA
BLOCK DIAGRAM OF
RA6 PIN
WR LATA
or
PORTA
D
Q
CK Q
Data Latch
WR
TRISA
D
Q
CK Q
TRIS Latch
RD
TRISA
ECIO or
RCIO
Enable
VDD
P
N I/O pin⁽¹⁾
VSS
TTL
Input
Buffer
Q
D
EN
RD PORTA
Note 1: I/O pins have protection diodes to VDD and VSS.
FIGURE 10-4:
BLOCK DIAGRAM OF
RA4/T0CKI PIN
RD LATA
Data
Bus
WR LATA
or
PORTA
WR TRISA
DQ
CK Q
Data Latch
DQ
CK Q
TRIS Latch
RD TRISA
I/O pin⁽¹⁾
N
VSS
Schmitt
Trigger
Input
Buffer
RD PORTA
Q
D
ENEN
TMR0 Clock Input
Note 1: I/O pins have protection diodes to VDD and VSS.
FIGURE 10-5:
RA7 Enable
Data
Bus
RD LATA
BLOCK DIAGRAM OF
RA7 PIN
To Oscillator
WR LATA
or
PORTA
D
Q
CK Q
Data Latch
WR
TRISA
D
Q
CK Q
TRIS Latch
RD
TRISA
RA7
Enable
VDD
P
N I/O pin⁽¹⁾
VSS
TTL
Input
Buffer
Q
D
EN
RD PORTA
Note 1: I/O pins have protection diodes to VDD and VSS.
DS39599C-page 102
 2003 Microchip Technology Inc.