AT89C5131-PLTIL View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89C5131-PLTIL

8-bit Flash Microcontroller with Full Speed USB Device

Atmel Corporation 

AT89C5131

Table 12. Power Signal Description (Continued)

Signal

Name Type Description

Alternate

Function

USB pull-up Controlled Output

VREF is used to control the USB D+ 1.5 kΩ pull up.

The Vref output is in high impedance when the bit DETACH is set in the

USBCON register.

VREF

O

-

When the bit DETACH is reseted,

In low-power chips, the Vref output voltage is equal to the AVDD input.

In standard versions, the Vref output voltage is equal to the internal

regulator output.

11

4136B–USB–09/03

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