PIC16F737-I Datasheet, PDF (57/276 Pages) Microchip Technology – 28/40/44-Pin, 8-Bit CMOS Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

PIC16F7X7
TABLE 5-1: PORTA FUNCTIONS
Name
Bit# Buffer
Function
RA0/AN0
RA1/AN1
RA2/AN2/VREF-/CVREF
RA3/AN3/VREF+
RA4/T0CKI/C1OUT
bit 0
TTL Input/output or analog input.
bit 1
TTL Input/output or analog input.
bit 2
TTL
Input/output or analog input or VREF-.
bit 3
TTL
Input/output or analog input or VREF+.
bit 4
ST
Input/output or external clock input for Timer0. Output is
open-drain type.
RA5/AN4/LVDIN/SS/C2OUT bit 5
TTL Input/output or slave select input for synchronous serial port or
analog input.
OSC2/CLKO/RA6
OSC1/CLKI/RA7
bit 6
ST
Input/output, connects to crystal or resonator, oscillator output or
1/4 the frequency of OSC1 and denotes the instruction cycle in
RC mode.
bit 7 ST/CMOS⁽¹⁾ Input/output, connects to crystal or resonator or oscillator input.
Legend: TTL = TTL input, ST = Schmitt Trigger input
Note 1: This buffer is a Schmitt Trigger input when configured in RC Oscillator mode and a CMOS input otherwise.
TABLE 5-2: SUMMARY OF REGISTERS 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
05h
PORTA
RA7 RA6 RA5 RA4 RA3 RA2
RA1 RA0 xx0x 0000 uu0u 0000
85h
TRISA PORTA Data Direction Register
1111 1111 1111 1111
9Fh
ADCON1 ADFM ADCS2 VCFG1 VCFG0 PCFG3 PCFG2 PCFG1 PCFG0 0000 0000 0000 0000
9Ch
CMCON C2OUT C1OUT C2INV C1INV CIS CM2 CM1 CM0 0000 0111 0000 0111
9Dh
CVRCON CVREN CVROE CVRR — CVR3 CVR2 CVR1 CVR0 000- 0000 000- 0000
Legend: x = unknown, u = unchanged, — = unimplemented locations read as ‘0’. Shaded cells are not used by PORTA.
Note: When using the SSP module in SPI Slave mode and SS enabled, the A/D converter must be set to one of
the following modes, where PCFG2:PCFG0 = 100, 101, 11x.
 2004 Microchip Technology Inc.
DS30498C-page 55