PIC16F84A datasheet(14/68 Pages) MICROCHIP

14 / 68 page

PIC16F84A

DS35007A-page 14

Preliminary

FIGURE 3-2:

BLOCK DIAGRAM OF PIN RA4

TABLE 3-1

PORTA FUNCTIONS

TABLE 3-2

SUMMARY OF REGISTERS ASSOCIATED WITH PORTA

Data

bus

PORT

TRIS

RD PORT

Data Latch

TRIS Latch

RD TRIS

Schmitt

Trigger

input

buffer

VSS

RA4 pin

TMR0 clock input

Note: I/O pin has protection diodes to VSS only.

Name

Bit0

Buffer Type

Function

RA0

bit0

TTL

Input/output

RA1

bit1

TTL

Input/output

RA2

bit2

TTL

Input/output

RA3

bit3

TTL

Input/output

RA4/T0CKI

bit4

Input/output or external clock input for TMR0.

Output is open drain type.

Legend: TTL = TTL input, ST = Schmitt Trigger input

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on

Power-on

Reset

Value on all

other resets

05h

PORTA

—

RA4/T0CKI

RA3

RA2

RA1

RA0

---x xxxx

---u uuuu

85h

TRISA

—

TRISA4

TRISA3

TRISA2

TRISA1

TRISA0

---1 1111

Legend: x = unknown, u = unchanged, - = unimplemented read as '0'. Shaded cells are unimplemented, read as '0'

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