PIC16C923-04I/CL Microchip Technology, PIC16C923-04I/CL Datasheet - Page 32

• Manufacturer Part Number: PIC16C923-04I/CL
• Description: 8-Bit CMOS Microcontroller with LCD Driver
• Manufacturer: Microchip Technology

PIC16C9XX
TABLE 5-1: PORTA FUNCTIONS
TABLE 5-2: SUMMARY OF REGISTERS ASSOCIATED WITH PORTA
DS30444E - page 32
Name
RA0/AN0
RA1/AN1
RA2/AN2
RA3/AN3/V
RA4/T0CKI
Address
05h
9Fh
Legend: x = unknown, u = unchanged, - = unimplemented locations read as '0'. Shaded cells are not used by PORTA.
Note 1: The ADCON1 register is implemented on the PIC16C924 only.
RA5/AN4/SS
Legend: TTL = TTL input, ST = Schmitt Trigger input
Note 1: The AN and V
85h
(1)
2: PIC16C923 reset values for PORTA: --xx xxxx for a POR, and --uu uuuu for all other resets,
PIC16C924 reset values for PORTA: --0x 0000 when read.
(1)
(1)
(1)
Name
PORTA
TRISA
ADCON1
REF
(1)
(1)
Bit#
bit0
bit1
bit2
bit3
bit4
bit5
Bit 7
—
—
—
REF
functions are for the A/D module and are only implemented on the PIC16C924.
Bit 6
Buffer
TTL
TTL
TTL
TTL
ST
TTL
—
—
—
PORTA Data Direction Control Register
Bit 5
RA5
—
Function
Input/output or analog input
Input/output or analog input
Input/output or analog input
Input/output or analog input or V
Input/output or external clock input for Timer0
Output is open drain type
Input/output or analog input or slave select input for synchronous serial port
Bit 4
RA4
—
Bit 3
RA3
—
PCFG2
Bit 2
RA2
REF
PCFG1
Bit 1
RA1
PCFG0
Bit 0
RA0
1997 Microchip Technology Inc.
--11 1111
---- -000
Power-on
Value on
Reset
(2)
--11 1111
---- -000
Value on
all other
resets
(2)