PIC14000 datasheet(9/153 Pages) MICROCHIP

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Preliminary

DS40122B-page 9

PIC14000

TABLE 3-1:

PIN DESCRIPTIONS

Pin Name

No.

I/O

Pin Type

Input Output

Description

CDAC

—

A/D ramp current source output. Normally connected to

external capacitor to generate a linear voltage ramp.

RA0/AN0

I/O

AN/ST

CMOS

Analog input channel 0. This pin can also serve as a

general-purpose I/O.

RA1/AN1

I/O

AN/ST

CMOS

Analog input channel 1. This pin can connect to a level

shift network. If enabled, a +0.5V offset is added to the

input voltage. This pin can also serve as a general-

purpose I/O.

RA2/AN2

I/O

AN/ST

CMOS

Analog input channel 2. This pin can also serve as a

general purpose digital I/O.

RA3/AN3

I/O

AN/ST

CMOS

Analog input channel 3. This pin can also serve as a gen-

eral purpose digital I/O.

SUM

—

AN1 summing junction output. This pin can be connected

to an external capacitor for averaging small duration

pulses.

RC0/REFA

I/O-PU

CMOS

LED direct-drive output or programmable reference A out-

put. This pin can also serve as a GPIO. If enabled, this

pin has a weak internal pull-up to VDD.

RC1/CMPA

I/O-PU

CMOS

LED direct-drive output or comparator A output. This pin

can also serve as a GPIO. If enabled, this pin has a weak

internal pull-up to VDD.

RC2

I/O-PU

CMOS

LED direct-drive output. This pin can also serve as a

GPIO. If enabled, this pin has a weak internal pull-up to

VDD

RC3/T0CKI

I/O-PU

CMOS

LED direct-drive output. This pin can also serve as a

GPIO, or an external clock input for Timer0. If enabled,

this pin has a weak internal pull-up to VDD.

RC4

I/O-PU

CMOS

LED direct-drive output. This pin can also serve as a

GPIO. If enabled, a change on this pin can cause a CPU

interrupt. If enabled, this pin has a weak internal pull-up

to VDD.

RC5

I/O-PU

CMOS

LED direct-drive output. This pin can also serve as a

GPIO. If enabled, a change on this pin can cause a CPU

interrupt. If enabled, this pin has a weak internal pull-up

to VDD.

RC6/SCLA

I/O

ST/SM

NPU/OD

(No P-diode)

General purpose I/O. If enabled, is multiplexed as

synchronous serial clock for I2C interface. Also is the

serial programming clock. If enabled, a change on this pin

can cause a CPU interrupt. This pin has an N-channel

pull-up device which is disabled in I2C mode.

RC7/SDAA

I/O

ST/SM

NPU/OD

(No P-diode)

General purpose I/O. If enabled, is multiplexed as

synchronous serial data I/O for I2C interface. Also is the

serial programming data line. If enabled, a change on this

pin can cause a CPU interrupt. This pin has an N-channel

pull-up device which is disabled in I2C mode.

RD0/SCLB

I/O

ST/SM

NPU/OD

(No P-diode)

General purpose I/O. If enabled, is multiplexed as

synchronous serial clock for I2C interface. This pin has an

N-channel pull-up device which is disabled in I2C mode.

RD1/SDAB

I/O

ST/SM

NPU/OD

(No P-diode)

General purpose I/O. If enabled, is multiplexed as

synchronous serial data I/O for I2C interface. This pin has

an N-channel pull-up device which is disabled in I2C

mode.

RD2/CMPB

I/O-PU

AN/ST

CMOS

General purpose I/O or comparator B output.

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