PIC16F870/871
TABLE 3-1:
Name
RA0/AN0
RA1/AN1
RA2/AN2
RA3/AN3/V
REF
RA4/T0CKI
RA5/AN4
PORTA FUNCTIONS
Bit#
bit0
bit1
bit2
bit3
bit4
bit5
Buffer
TTL
TTL
TTL
TTL
ST
TTL
Input/output or analog input
Input/output or analog input
Input/output or analog input
Input/output or analog input or V
REF
Input/output or external clock input for Timer0
Output is open drain type
Input/output or analog input
Function
Legend: TTL = TTL input, ST = Schmitt Trigger input
TABLE 3-2:
Address
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
Value on
all
other
resets
05h
85h
9Fh
PORTA
TRISA
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
RA5
鈥?/div>
RA4
鈥?/div>
RA3
RA2
RA1
RA0
--0x 0000 --0u 0000
--11 1111 --11 1111
PORTA Data Direction Register
ADCON1 ADFM
PCFG3 PCFG2 PCFG1 PCFG0
--0- 0000 --0- 0000
Legend:
x
= unknown,
u
= unchanged,
-
= unimplemented locations read as '0'. Shaded cells are not used by
PORTA.
DS30569A-page 28
Preliminary
漏
1999 Microchip Technology Inc.
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