AT89C5131A-L(2004) データシートの表示（PDF） - Atmel Corporation

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AT89C5131A-L
(Rev.:2004)

8-bit Flash Microcontroller with Full Speed USB Device

Atmel Corporation 

4338A–USB–08/04

AT89C5131A-L

Table 8. Ports Signal Description

Signal

Name

P0[7:0]

Type Description

Port 0

P0 is an 8-bit open-drain bidirectional I/O port. Port 0

I/O

pins that have 1s written to them float and can be used

as high impedance inputs. To avoid any parasitic current

consumption, Floating P0 inputs must be pulled to VDD or

VSS.

P1[7:0]

Port 1

I/O

P1 is an 8-bit bidirectional I/O port with internal pull-ups,

except for P1.6 and P1.7 that are true open drain

outputs.

P2[7:0]

I/O

Port 2

P2 is an 8-bit bidirectional I/O port with internal pull-ups.

P3[7:0]

I/O

Port 3

P3 is an 8-bit bidirectional I/O port with internal pull-ups.

P4[1:0]

I/O

Port 4

P4 is an 2-bit open port.

Alternate Function

AD[7:0]

KIN[7:0]

T2

T2EX

ECI

CEX[4:0]

A[15:8]

LED[3:0]

RxD

TxD

INT0

INT1

T0

T1

WR

RD

SCL

SDA

Table 9. Clock Signal Description

Signal

Name Type Description

Alternate

Function

Input to the on-chip inverting oscillator amplifier

XTAL1

I To use the internal oscillator, a crystal/resonator circuit is connected to this

-

pin. If an external oscillator is used, its output is connected to this pin.

Output of the on-chip inverting oscillator amplifier

XTAL2 O To use the internal oscillator, a crystal/resonator circuit is connected to this

-

pin. If an external oscillator is used, leave XTAL2 unconnected.

PLL Low Pass Filter input

PLLF

I Receives the RC network of the PLL low pass filter (See Figure 5 on page

-

13 ).

Table 10. USB Signal Description

Signal

Name

D+

Type Description

I/O USB Data + signal

D-

VREF

I/O USB Data - signal

O

USB Reference Voltage

Connect this pin to D+ using a 1.5 kΩ resistor to use the Detach function.

Alternate

Function

-

-

-

9

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