PIC16LC774T-I/PT View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
PIC16LC774T-I/PT Datasheet PDF : 202 Pages
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PIC16C77X
FIGURE 3-2: BLOCK DIAGRAM OF
RA1:RA0 AND RA5 PINS
Data
bus
WR
Port
D
Q
CK Q
Data Latch
D
Q
VDD
P
N
I/O pin(1)
WR
TRIS
CK Q
TRIS Latch
VSS
Analog
input
mode
RD TRIS
Q
D
TTL
input
buffer
EN
RD PORT
FIGURE 3-3: BLOCK DIAGRAM OF
RA4/T0CKI PIN
Data
bus
WR
PORT
DQ
CK Q
Data Latch
N
I/O pin(1)
WR
TRIS
DQ
CK Q
TRIS Latch
VSS
Schmitt
Trigger
input
buffer
RD TRIS
Q
D
RD PORT
ENEN
TMR0 clock input
Note 1: I/O pin has protection diodes to VSS only.
To A/D Converter
Note 1: I/O pins have protection diodes to VDD and
VSS.
TABLE 3-1 PORTA FUNCTIONS
Name
Bit# Buffer Function
RA0/AN0
bit0
RA1/AN1
bit1
RA2/AN2/VREF-/VRL bit2
RA3/AN3/VREF+/VRH bit3
RA4/T0CKI
bit4
RA5/AN4(1)
bit5
TTL Input/output or analog input0
TTL Input/output or analog input1
TTL Input/output or analog input2 or VREF- input or internal reference
voltage low
TTL Input/output or analog input or VREF+ input or output of internal
reference voltage high
ST
Input/output or external clock input for Timer0
Output is open drain type
TTL Input/output or analog input
Legend: TTL = TTL input, ST = Schmitt Trigger input
Note 1: RA5 is reserved on the 28-pin devices, maintain this bit clear.
TABLE 3-2 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(1) —
—
RA5 RA4 RA3 RA2 RA1 RA0 --0x 0000 --0u 0000
85h
TRISA(1)
—
— PORTA Data Direction Register
--11 1111 --11 1111
9Fh
ADCON1 ADFM VCFG2 VCFG1 VCFG0 PCFG3 PCFG2 PCFG1 PCFG0 0000 0000 0000 0000
Legend: x = unknown, u = unchanged, - = unimplemented locations read as '0'. Shaded cells are not used by PORTA.
Note 1: PORTA<5>, TRISA<5> are reserved on the 28-pin devices, maintain these bits clear.
DS30275B-page 28
Advance Information
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