ATMEGA32U4-MUR Atmel, ATMEGA32U4-MUR Datasheet - Page 257
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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21.6
21.6.1
21.6.2
21.6.3
7766F–AVR–11/10
General Operating Modes
Introduction
Power-on and reset
Interrupts
The USB controller is disabled and reset after an hardware reset generated by:
But another available and optional CPU reset source is:
In this case, the USB controller is reset, but not disabled (so that the device remains attached).
The next diagram explains the USB controller main states on power-on:
Figure 21-7. USB controller states after reset
USB Controller state after an hardware reset is ‘Reset’. In this state:
After setting USBE, the USB Controller enters the Device state. The controller is ‘Idle’.
The USB Controller can at any time be stopped by clearing USBE. In fact, clearing USBE acts
as an hardware reset.
Two interrupts vectors are assigned to USB interface.
• USBE is not set
• the USB controller clock is stopped in order to minimize the power consumption
• the USB controller is disabled,
• the USB pad is in the suspend mode,
• the Device USB controller internal state is reset.
(FRZCLK=1),
– Power on reset
– External reset
– Watchdog reset
– Brown out reset
– JTAG reset
– USB End Of Reset
Clock stopped
Dev ice
FRZCLK=1
Macro off
USBE=1
USBE=0
Reset
USBE=0
RESET
HW
USBE=0
<any other
state>
ATmega16/32U4
257
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