PIC17C75X Datasheet, PDF (67/320 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM Microcontrollers

PIC17C75X
TABLE 10-1: PORTA FUNCTIONS
Name
Bit0
Buffer
Type
Function
RA0/INT
bit0
ST
RA1/T0CKI
bit1
ST
RA2/SS/SCL bit2
ST
RA3/SDI/SDA bit3
ST
RA4/RX1/DT1 bit4
ST
RA5/TX1/CK1 bit5
ST
RBPU
bit7
—
Legend: ST = Schmitt Trigger input.
Input or external interrupt input.
Input or clock input to the TMR0 timer/counter, and/or an external interrupt
input.
Input/Output or slave select input for the SPI or clock input for the I²C bus.
Output is open drain type.
Input/Output or data input for the SPI or data for the I²C bus.
Output is open drain type.
Input/Output or USART1 Asynchronous Receive or
USART1 Synchronous Data.
Input/Output or USART1 Asynchronous Transmit or
USART1 Synchronous Clock.
Control bit for PORTB weak pull-ups.
TABLE 10-2: REGISTERS/BITS ASSOCIATED WITH PORTA
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
(Note1)
10h, Bank 0
PORTA
RBPU
—
RA5/
TX1/CK1
RA4/
RX1/DT1
RA3/
SDI/SDA
RA2/
SS/SCL
RA1/T0CKI
RA0/INT
0-xx xxxx
05h, Unbanked T0STA INTEDG T0SE T0CS
PS3
PS2
PS1
PS0
—
0000 000-
13h, Bank 0
RCSTA1 SPEN RC9 SREN CREN
—
FERR
OERR
RC9D 0000 -00x
15h, Bank 0
TXSTA1 CSRC TX9 TXEN SYNC
—
—
TRMT
TX9D 0000 --1x
Legend: x = unknown, u = unchanged, - = unimplemented reads as '0'. Shaded cells are not used by PORTA.
Note 1: Other (non power-up) resets include: external reset through MCLR and the Watchdog Timer Reset.
0-uu uuuu
0000 000-
0000 -00u
0000 --1u
© 1997 Microchip Technology Inc.
Preliminary
DS30264A-page 67