Datasheet
2010 Microchip Technology Inc. Preliminary DS41412C-page 135
PIC18(L)F2X/4XK22
RA6/CLKO/OSC2 RA6 01O DIG LATA<6> data output; enabled in INTOSC modes when
CLKO is not enabled.
10I TTL PORTA<6> data input; enabled in INTOSC modes when
CLKO is not enabled.
CLKO x1O DIG In RC mode, OSC2 pin outputs CLKOUT which has 1/4 the
frequency of OSC1 and denotes the instruction cycle rate.
OSC2 xxO XTAL Oscillator crystal output; connects to crystal or resonator in
Crystal Oscillator mode.
RA7/CLKI/OSC1 RA7 01O DIG LATA<7> data output; disabled in external oscillator modes.
10I TTL PORTA<7> data input; disabled in external oscillator
modes.
CLKI x1I AN External clock source input; always associated with pin
function OSC1.
OSC1 xxI XTAL Oscillator crystal input or external clock source input ST
buffer when configured in RC mode; CMOS otherwise.
TABLE 10-1: PORTA I/O SUMMARY (CONTINUED)
Pin Name Function
TRIS
Setting
ANSEL
Setting
Pin
Type
Buffer
Type
Description
Legend: AN = Analog input or output; TTL = TTL compatible input; HV = High Voltage; OD = Open Drain; XTAL = Crystal; CMOS
= CMOS compatible input or output; ST = Schmitt Trigger input with CMOS levels; I
2
C
TM
= Schmitt Trigger input with
I
2
C.
TABLE 10-2: REGISTERS ASSOCIATED WITH PORTA
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Register
on Page
ANSELA — — ANSA5 — ANSA3 ANSA2 ANSA1 ANSA0 152
CM1CON0 C1ON C1OUT C1OE
C1POL C1SP C1R C1CH<1:0> 310
CM2CON0 C2ON C2OUT C2OE C2POL C2SP C2R C2CH<1:0> 311
VREFCON1 DACEN DACLPS DACOE — DACPSS<1:0> — DACNSS 341
VREFCON2
— — — DACR<4:0> 342
HLVDCON VDIRMAG BGVST IRVST HLVDEN HLVDL<3:0> 343
PORTA RA7 RA6 RA5 RA4 RA3 RA2 RA1 RA0 151
SLRCON
— — — SLRE SLRD SLRC SLRB SLRA 156
SRCON0 SRLEN SRCLK<2:0> SRQEN SRNQEN SRPS SRPR 335
SSP1CON1 WCOL SSPOV SSPEN CKP SSPM<3:0> 256
T0CON
TMR0ON T08BIT T0CS T0SE PSA T0PS<2:0> 157
TRISA TRISA7 TRISA6 TRISA5 TRISA4 TRISA3 TRISA2 TRISA1 TRISA0 154
Legend: — = unimplemented locations, read as ‘0’. Shaded bits are not used for PORTA.
TABLE 10-3: CONFIGURATION REGISTERS ASSOCIATED WITH PORTA
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Register
on Page
CONFIG1H
IESO FCMEN PRICLKEN PLLCFG FOSC<3:0> 351
Legend: — = unimplemented locations, read as ‘0’. Shaded bits are not used for PORTA.