AT89LP216-20PI datasheet(26/90 Pages) ATMEL

26 / 90 page

3621A–MICRO–6/06

AT89LP216 [Preliminary]

13.4

Port Alternate Functions

Most general-purpose digital I/O pins of the AT89LP216 share functionality with the various I/Os

needed for the peripheral units. Table 13-5 lists the alternate functions of the port pins. Alternate

functions are connected to the pins in a logic AND fashion. In order to enable the

alternate function on a port pin, that pin must have a “1” in its corresponding port register bit,

otherwise the input/output will always be “0”. Furthermore, each pin must be configured

for the correct input/output mode as required by its peripheral before it may be used as such.

Table 13-4 shows how to configure a generic pin for use with an alternate function.

Table 13-4.

Alternate Function Configurations for Pin y of Port x

PxM0.y

PxM1.y

Px.y

I/O Mode

bidirectional (internal pull-up)

output

input

bidirectional (external pull-up)

Table 13-5.

Port Pin Alternate Functions

Port Pin

Configuration Bits

Alternate

Function

Notes

PxM0.y

PxM1.y

P1.0

P1M0.0

P1M1.0

AIN0

input-only

GPI0

P1.1

P1M0.1

P1M1.1

AIN1

input-only

GPI1

P1.2

P1M0.2

P1M1.2

GPI2

P1.3

P1M0.3

P1M1.3

GPI3

RST must be disabled

P1.4

P1M0.4

P1M1.4

GPI4

P1.5

P1M0.5

P1M1.5

MOSI

GPI5

P1.6

P1M0.6

P1M1.6

MISO

GPI6

P1.7

P1M0.7

P1M1.7

SCK

GPI7

P3.0

P3M0.0

P3M1.0

RXD

P3.1

P3M0.1

P3M1.1

TXD

P3.2

P3M0.2

P3M1.2

INT0

Internal RC Oscillator Only

P3.3

P3M0.3

P3M1.3

INT1

Internal RC Oscillator or

External Clock Source Only

CLKOUT

P3.4

P3M0.4

P3M1.4

P3.5

P3M0.5

P3M1.5

P3.6

not configurable

CMPOUT

Pin is tied to comparator output

AT89LP216-20PI bảng dữ liệu(PDF) 26 Page - ATMEL Corporation

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