ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 261
ATmega32U4
Manufacturer Part Number
ATmega32U4
Description
Manufacturer
Atmel Corporation
Specifications of ATmega32U4
Flash (kbytes)
32 Kbytes
Pin Count
44
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
14
Hardware Qtouch Acquisition
No
Max I/o Pins
26
Ext Interrupts
13
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Twi (i2c)
1
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
12
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
3.3
Eeprom (bytes)
1024
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
4
Output Compare Channels
12
Input Capture Channels
2
Pwm Channels
8
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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21.10 PAD suspend
7766F–AVR–11/10
EPEN=1
ALLOC=1
The following figure illustrates the allocation and reorganization of the USB memory in a typical
example:
Table 21-1.
Note that:
The next figures illustrates the pad behaviour:
• First, Endpoint 0 to Endpoint 5 are configured, in the growing order. The memory of each is
• Then, the Endpoint 3 is disabled (EPEN=0), but its memory reservation is internally kept by
• Its ALLOC bit is cleared: the Endpoint 4 “slides” down, but the Endpoint 5 does not “slide”.
• Finally, if the firmware chooses to reconfigure the Endpoint 3, with a bigger size. The
• the data of Endpoint 0 are never lost whatever the activation or deactivation of the higher
• Deactivate and reactivate the same Endpoint with the same parameters does not lead to a
• CFGOK is set by hardware even in the case where there is a “conflict” in the memory
• In the “idle” mode, the pad is put in low power consumption mode.
• In the “active” mode, the pad is working.
Free memory
Endpoints
reserved in the DPRAM.
the controller.
controller reserved the memory after the Endpoint 2 memory and automatically “slide” the
Endpoint 4. The Endpoint 5 does not move and a memory conflict appear, in that both
Endpoint 4 and 5 use a common area. The data of those endpoints are potentially lost.
Endpoint. Its data is lost if it is deactivated.
“slide” of the higher endpoints. For those endpoints, the data are preserved.
allocation.
activation
5
4
3
2
1
0
Allocation and reorganization USB memory flow
Endpoint Disable
Free memory
(ALLOC=1)
EPEN=0
5
4
2
1
0
Free its memory
Free memory
Lost memory
(ALLOC=0)
5
4
2
1
0
ATmega16/32U4
3 (bigger size)
Free memory
Activatation
Endpoint
4
2
1
0
5
Conflict
261
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