PIC18F2331 Datasheet, PDF (113/396 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High Performance PWM and A/D

PIC18F2331/2431/4331/4431
TABLE 10-1: PORTA FUNCTIONS
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-/CAP1/INDX bit 2 TTL/ST Input/output, analog input, VREF-, capture input, or QEI Index
input.
RA3/AN3/VREF+/CAP2/QEA bit 3 TTL/ST Input/output, analog input, VREF+, capture input, or Quadrature
Channel A input.
RA4/AN4/CAP3/QEB
bit 4 TTL/ST Input/output, analog input, capture input, or Quadrature Channel
B input.
RA5/AN5/LVDIN
bit 5 TTL Input/output, analog input, or low-voltage detect input.
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
TABLE 10-2: SUMMARY OF REGISTERS ASSOCIATED WITH PORTA
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
LATA
TRISA
ADCON1
ANSEL0
ANSEL1
Legend:
Note 1:
2:
RA7⁽¹⁾
RA6⁽¹⁾
RA5
RA4
RA3
RA2
RA1
RA0 xx0x 0000 uu0u 0000
LATA7⁽¹⁾ LATA6⁽¹⁾ LATA Data Output Register
TRISA7⁽¹⁾ TRISA6⁽¹⁾ PORTA Data Direction Register
xxxx xxxx uuuu uuuu
1111 1111 1111 1111
VCFG1
ANS7⁽²⁾
—
VCFG0
ANS6⁽²⁾
—
—
ANS5⁽²⁾
—
FIFOEN
ANS4
—
BFEMT
ANS3
—
BFOVFL
ANS2
—
ADPNT1
ANS1
—
ADPNT0 00-1 0000 00-1 0000
ANS0 1111 1111 1111 1111
ANS8⁽²⁾ ---- ---1 ---- ---1
x = unknown, u = unchanged, – = unimplemented locations read as ‘0’. Shaded cells are not used by PORTA.
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’.
ANS5 through ANS8 are available only on the PIC18F4X31 devices.
 2003 Microchip Technology Inc.
Preliminary
DS39616B-page 111