at89c5131 ATMEL Corporation, at89c5131 Datasheet - Page 11
at89c5131
Manufacturer Part Number
at89c5131
Description
8-bit Flash Microcontroller With Full Speed Usb Device At89c5131
Manufacturer
ATMEL Corporation
Datasheet
1.AT89C5131.pdf
(176 pages)
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AT89C5131
Table 12. Power Signal Description (Continued)
Signal
Alternate
Name
Type
Description
Function
USB pull-up Controlled Output
VREF is used to control the USB D+ 1.5 kΩ pull up.
VREF
O
-
The Vref output is in high impedance when the bit DETACH is set in the
USBCON register.
11
4136C–USB–04/05