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AT89C5131-RDTIL Datasheet(PDF) 11 Page - ATMEL Corporation

Part # AT89C5131-RDTIL
Description  8-bit Flash Microcontroller with Full Speed USB Device
PDF  176 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C5131-RDTIL Datasheet(HTML) 11 Page - ATMEL Corporation

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11
AT89C5131
4136B–USB–09/03
VREF
O
USB pull-up Controlled Output
VREF is used to control the USB D+ 1.5 k
Ω pull up.
The Vref output is in high impedance when the bit DETACH is set in the
USBCON register.
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.
-
Table 12. Power Signal Description (Continued)
Signal
Name
Type
Description
Alternate
Function



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