2007 Microchip Technology Inc.
DS39599G-page 103
PIC18F2220/2320/4220/4320
TABLE 10-1:
PORTA FUNCTIONS
TABLE 10-2:
SUMMARY OF REGISTERS ASSOCIATED WITH PORTA
Name
Bit#
Buffer
Function
RA0/AN0
bit 0
TTL
Input/output or analog input.
RA1/AN1
bit 1
TTL
Input/output or analog input.
RA2/AN2/VREF-/CVREF
bit 2
TTL
Input/output, analog input, VREF- or comparator VREF output.
RA3/AN3/VREF+
bit 3
TTL
Input/output, analog input or VREF+.
RA4/T0CKI/C1OUT
bit 4
ST
Input/output, external clock input for Timer0 or Comparator 1
output. Output is open-drain type.
RA5/AN4/SS/LVDIN/C2OUT
bit 5
TTL
Input/output, analog input, slave select input for Master
Synchronous Serial Port, Low-Voltage Detect input or
Comparator 2 output.
OSC2/CLKO/RA6
bit 6
TTL
OSC2, clock output or I/O pin.
OSC1/CLKI/RA7
bit 7
TTL
OSC1, clock input or I/O pin.
Legend: TTL = TTL input, ST = Schmitt Trigger input
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR, BOR
Value on
all other
Resets
PORTA
RA7(1)
RA6(1)
RA5
RA4
RA3
RA2
RA1
RA0
xx0x 0000 uu0u 0000
LATA
LATA7(1)
LATA6(1) LATA Data Latch Register
xxxx xxxx uuuu uuuu
TRISA
TRISA7(1) TRISA6(1) PORTA Data Direction Register
1111 1111 1111 1111
ADCON1
VCFG1
VCFG0PCFG3
PCFG2PCFG1
PCFG0
--00 0000 --00 0000
CMCON
C2OUT
C1OUT
C2INV
C1INV
CIS
CM2
CM1
CM0
0000 0111 0000 0111
CVRCON
CVREN
CVROE
CVRR
CVR3
CVR2
CVR1
CVR0
000- 0000 000- 0000
Legend: x = unknown, u = unchanged, - = unimplemented locations read as ‘0’. Shaded cells are not used by PORTA.
Note 1:
RA7:RA6 and their associated latch and data direction bits are enabled as I/O pins based on oscillator configuration;
otherwise, they are read as ‘0’.
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