PIC16F716
DS41206A-page 20
Preliminary
2003 Microchip Technology Inc.
FIGURE 3-2:
BLOCK DIAGRAM OF
RA4/T0CKI PIN
TABLE 3-1:
PORTA FUNCTIONS
TABLE 3-2:
SUMMARY OF REGISTERS ASSOCIATED WITH PORTA
DATA
BUS
WR
PORT
WR
TRIS
RD PORT
Data Latch
TRIS Latch
RD TRIS
Schmitt
Trigger
Input
Buffer
N
V
SS
RA4/T0CKI
TMR0 Clock Input
Q
D
Q
CK
EN
Q
D
EN
V
SS
Q
D
Q
CK
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
bit 2
TTL
Input/output or analog input
RA3/AN3/V
REF
bit 3
TTL
Input/output or analog input or V
REF
RA4/T0CKI
bit 4
ST
Input/output or external clock input for Timer0
Output is open drain type
Legend: TTL = TTL input, ST = Schmitt Trigger input
Address
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
05h
PORTA
—
—
—
(1)
RA4
RA3
RA2
RA1
RA0
--xx 0000
--uu uuuu
85h
TRISA
—
—
—
(1)
PORTA Data Direction Register
--11 1111
--11 1111
9Fh
ADCON1
—
—
—
—
—
PCFG2 PCFG1 PCFG0
---- -000
---- -000
Legend:
x
= unknown,
u
= unchanged,
-
= unimplemented locations read as ‘
0
’. Shaded cells are not used by
PORTA.
Note 1:
Reserved bits, do not use.
Summary of Contents for PIC16F716
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