ATMEGA32U4-MUR Atmel, ATMEGA32U4-MUR Datasheet - Page 263
ATMEGA32U4-MUR
Manufacturer Part Number
ATMEGA32U4-MUR
Description
MCU AVR 16K FLASH 16MHZ 44VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA16U4-MU.pdf
(433 pages)
Specifications of ATMEGA32U4-MUR
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, SPI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
26
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2.5K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 12x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-VQFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA32U4-MUR
Manufacturer:
UCC
Quantity:
1 001
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21.12 Registers description
21.12.1
7766F–AVR–11/10
USB general registers
Figure 21-13. Plug-in Detection Input Block Diagram
The control logic of the VBUS pad outputs a signal regarding the VBUS voltage level:
• 7-1 – Reserved
These bits are reserved. Do not modify these bits.
• 0 – UVREGE: USB pad regulator Enable
Set to enable the USB pad regulator. Clear to disable the USB pad regulator.
• 7 – USBE: USB macro Enable Bit
Set to enable the USB controller. Clear to disable and reset the USB controller, to disable the
USB transceiver and to disable the USB controller clock inputs.
• 6 – Reserved
The value read from these bits is always 0. Do not set these bits.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
• The “Session_valid” signal is active high when the voltage on the UVBUS pad is higher or
• The VBUS status bit is set when “Session_valid” signal is active (VBUS > 1.4V).
• The VBUSTI flag is set each time the VBUS state changes.
• The USB peripheral cannot attach to the bus while VBUS bit is not set.
equal to 1.4V. If lower than 1.4V, the signal is not active.
VBUS
USBE
R/W
R/W
7
0
7
0
-
R/W
R/W
0
6
-
6
0
-
Pad logic
FRZCLK
R/W
VDD
VSS
R
5
0
5
1
-
OTGPADE
R/W
Session_valid
R/W
4
0
-
4
0
R
3
0
-
R
3
0
-
USBSTA.0
VBUS
R
2
0
-
R
2
0
-
R
R/W
1
0
ATmega16/32U4
-
1
0
-
UVREGE
VBUSTE
R/W
R/W
0
0
0
0
VBUSTI
USBINT.0
UHWCON
USBCON
263
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