PIC16F882_09 Datasheet, PDF (48/328 Pages) Microchip Technology – 28/40/44-Pin, Enhanced Flash-Based 8-Bit CMOS Microcontrollers with nanoWatt Technology

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
Data Bus
WR
PORTA
DQ
CK _Q
WR
TRISA
DQ
CK _Q
RD
TRISA
Oscillator
Circuit
OSC1
VDD
INTOSC
Mode
I/O Pin
VSS
RD
PORTA
CLKIN
TABLE 3-1: 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
ADCON0
ADCS1 ADCS0 CHS3
CHS2
CHS1
CHS0 GO/DONE ADON
0000 0000
ANSEL
ANS7
ANS6
ANS5
ANS4
ANS3
ANS2
ANS1
ANS0
1111 1111
CM1CON0
C1ON C1OUT C1OE C1POL
—
C1R
C1CH1 C1CH0 0000 -000
CM2CON0
C2ON C2OUT C2OE C2POL
—
C2R
C2CH1 C2CH0 0000 -000
CM2CON1
MC1OUT MC2OUT C1RSEL C2RSEL
—
—
T1GSS C2SYNC 0000 --10
PCON
—
—
ULPWUE SBOREN
—
—
POR
BOR
--01 --qq
OPTION_REG RBPU INTEDG T0CS
T0SE
PSA
PS2
PS1
PS0
1111 1111
PORTA
RA7
RA6
RA5
RA4
RA3
RA2
RA1
RA0
xxxx xxxx
SSPCON
WCOL SSPOV SSPEN
CKP
SSPM3 SSPM2 SSPM1 SSPM0 0000 0000
TRISA
TRISA7 TRISA6 TRISA5 TRISA4 TRISA3 TRISA2 TRISA1 TRISA0 1111 1111
Legend: x = unknown, u = unchanged, – = unimplemented locations read as ‘0’. Shaded cells are not used by PORTA.
Value on
all other
Resets
0000 0000
1111 1111
0000 -000
0000 -000
0000 --10
--0u --uu
1111 1111
uuuu uuuu
0000 0000
1111 1111
DS41291F-page 46
© 2009 Microchip Technology Inc.