AT89C5131A-RDTIM Atmel, AT89C5131A-RDTIM Datasheet - Page 11

• Manufacturer Part Number: AT89C5131A-RDTIM
• Description: C5131A 32K FLASH USB VQFP64 IND, 5V
• Manufacturer: Atmel

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