ATMEGA32U2-AUR Atmel, ATMEGA32U2-AUR Datasheet - Page 192
![MCU AVR 32K FLASH 16MHZ 32TQFP](/photos/6/91/69154/313-32-tqfp_sml.jpg)
ATMEGA32U2-AUR
Manufacturer Part Number
ATMEGA32U2-AUR
Description
MCU AVR 32K FLASH 16MHZ 32TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA32U2-AUR
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
22
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-TQFP, 32-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
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20.5.3
20.6
7799D–AVR–11/10
Memory management
Freeze clock
EPEN=1
ALLOC=1
The firmware has the ability to freeze the clock of USB controller by setting the FRZCLK bit, and
thereby reduce the power consumption. When FRZCLK is set, it is still possible to access to the
following registers:
When FRZCLK is set, only the asynchronous interrupt may be triggered:
The controller does only support the following memory allocation management.
The reservation of an Endpoint can only be made in the increasing order (Endpoint 0 to the last
Endpoint). The firmware shall thus configure them in the same order.
The reservation of an Endpoint k
cates the memory and insert it between the Endpoints k
“slides” up and its data is lost. Note that the k
Clearing an Endpoint enable (EPEN) does not clear either its ALLOC bit, or its configuration
(EPSIZE/PSIZE, EPBK/PBK). To free its memory, the firmware should clear ALLOC. Then, the
k
does not slide.
The following figure illustrates the allocation and reorganization of the USB memory in a typical
example:
Table 20-1.
i+1
Free memory
• USBCON
• DPRAM direct access registers (DPADD7:0, UEDATX)
• UDCON
• UDINT
• UDIEN
• WAKEUPI
Endpoints
activation
Endpoint memory automatically slides down. Note that the k
4
3
2
1
0
Allocation and reorganization USB memory flow
Endpoint Disable
Free memory
(ALLOC=1)
EPEN=0
4
3
1
0
i
is done when its ALLOC bit is set. Then, the hardware allo-
i+2
Free its memory
Free memory
Lost memory
(ALLOC=0)
and upper Endpoint memory does not slide.
ATmega8U2/16U2/32U2
4
3
1
0
i-1
and k
i+2
i+1
and upper Endpoint memory
. The k
2 (bigger size)
Free memory
Activatation
Endpoint
3
1
0
4
i+1
Endpoint memory
Conflict
192
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