AT89C5130A/31A-M
Table 12. Power Signal Description (Continued)
Signal
Name Type Description
VDD
PWR
Digital Supply Voltage
VDD is used to supply the buffer ring on all versions of the device.
It is also used to power the on-chip voltage regulator of the Standard
versions or the digital core of the Low Power versions.
VREF
USB pull-up Controlled Output
O 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.
Alternate
Function
-
-
11
4337C–USB–02/05