Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller SSOP 28 8-Bit 20 MHz I/O number 24

PIC16F882/883/884/886/887

3.2.3.8 RA7/OSC1/CLKIN

Figure 3-8 shows the diagram for this pin. This pin is

configurable to function as one of the following:

• a general purpose I/O

• a crystal/resonator connection

• a clock input

FIGURE 3-8: BLOCK DIAGRAM OF RA7

TABLE 3-1: SUMMARY OF REGISTERS ASSOCIATED WITH PORTA

I/O Pin

VDD

VSS

Data Bus

PORTA

TRISA

INTOSC

Mode

OSC1

CLKIN

Circuit

Oscillator

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

ADCON0

ADCS1 ADCS0 CHS3 CHS2 CHS1 CHS0

GO/DONE

ADON 0000 0000 0000 0000

ANSEL

ANS7 ANS6 ANS5 ANS4 ANS3 ANS2 ANS1 ANS0 1111 1111 1111 1111

CM1CON0

C1ON C1OUT C1OE C1POL — C1R C1CH1 C1CH0 0000 -000 0000 -000

CM2CON0

C2ON C2OUT C2OE C2POL — C2R C2CH1 C2CH0 0000 -000 0000 -000

CM2CON1

MC1OUT MC2OUT C1RSEL C2RSEL — — T1GSS C2SYNC 0000 --10 0000 --10

PCON

— — ULPWUE SBOREN — —PORBOR --01 --qq --0u --uu

OPTION_REG

RBPU INTEDG T0CS T0SE PSA PS2 PS1 PS0 1111 1111 1111 1111

PORTA RA7 RA6 RA5 RA4 RA3 RA2 RA1 RA0 xxxx xxxx uuuu uuuu

SSPCON

WCOL SSPOV SSPEN CKP SSPM3 SSPM2 SSPM1 SSPM0 0000 0000 0000 0000

TRISA TRISA7 TRISA6 TRISA5 TRISA4 TRISA3 TRISA2 TRISA1 TRISA0 1111 1111 1111 1111

Legend: x = unknown, u = unchanged, – = unimplemented locations read as ‘0’. Shaded cells are not used by PORTA.