PIC18F258 MICROCHIP [Microchip Technology], PIC18F258 Datasheet - Page 96

• Manufacturer Part Number: PIC18F258
• Description: High Performance, 28/40-Pin Enhanced FLASH Microcontrollers with CAN
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18FXX8
FIGURE 9-3:
TABLE 9-1:
TABLE 9-2:
DS41159B-page 94
RA0/AN0/CV
RA1/AN1
RA2/AN2/V
RA3/AN3/V
RA4/T0CKI
RA5/SS/AN4/LVDIN
RA6/OSC2/CLKO
Legend: TTL = TTL input, ST = Schmitt Trigger input, OD = Open Drain
PORTA
LATA
TRISA
ADCON1
Legend: x = unknown, u = unchanged, - = unimplemented locations read as '0'. Shaded cells are not used by PORTA.
Name
Name
REF
REF
ADFM ADCS2
REF
Bit 7
—
—
—
-
+
PORTA FUNCTIONS
SUMMARY OF REGISTERS ASSOCIATED WITH PORTA
(F
CLKO (F
Data Bus
WR PORTA
WR TRISA
(F
101 , 110 , 111 )
RD TRISA
RD PORTA
(F
Note
OSC
OSC
OSC
Latch A Data Output Register
PORTA Data Direction Register
RA6/OSC2/CLKOUT PIN BLOCK DIAGRAM
Bit 6
RA6
= 101 , 111 )
= 100 ,
= 110 , 100 )
1: CLKO is 1/4 of F
2: I/O pin has diode protection to V
OSC
Bit#
bit0
bit1
bit2
bit3
bit4
bit5
bit6
/4)
Bit 5
RA5
—
TRIS Latch
Data Latch
D
D
CK
CK
Buffer
ST/OD Input/output, external clock input for Timer0, output is open drain type.
TTL
TTL
TTL
TTL
TTL
TTL
Q
Q
Q
Q
OSC
Bit 4
RA4
—
.
Input/output, analog input, or analog comparator voltage reference
output.
Input/output or analog input.
Input/output, analog input or V
Input/output, analog input or V
Input/output, slave select input for synchronous serial port, analog input,
or low voltage detect input.
Input/output or oscillator clock output.
PCFG3
Preliminary
1
Bit 3
0
RA3
DD
Data Latch
Q
and V
PCFG2
SS
EN
Bit 2
RA2
D
.
From OSC1
PCFG1
Bit 1
RA1
REF
REF
Function
Oscillator
Circuit
-.
+.
V
V
N
P
Schmitt
Trigger
Input Buffer
DD
SS
PCFG0 00-- 0000 uu-- uuuu
Bit 0
RA0
 2002 Microchip Technology Inc.
-00x 0000 -uuu uuuu
-xxx xxxx -uuu uuuu
-111 1111 -111 1111
POR, BOR
Value on
RA6/OSC2/
CLKO pin
(2)
Value on
all other
RESETS