ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 50
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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8.0.3
7766F–AVR–11/10
Power-on Reset
Figure 8-1.
Table 8-1.
Notes:
A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level
is defined in
POR circuit can be used to trigger the start-up Reset, as well as to detect a failure in supply
voltage.
A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reaching the
Power-on Reset threshold voltage invokes the delay counter, which determines how long the
Symbol
V
V
V
V
t
CCRR
RST
POR
POT
RST
BODLEVEL [2..0]
1. The Power-on Reset will not work unless the supply voltage has been below V
Parameter
Power-on Reset Threshold Voltage (rising)
Power-on Reset Threshold Voltage (falling)
V
Reset signal
VCC Rise Rate to ensure internal Power_on
Reset signal
Minimum pulse width on RESET Pin
RESET Pin Threshold Voltage
CC
Table
Reset Logic
Reset Characteristics
Start Voltage to ensure internal Power-on
8-1. The POR is activated whenever V
Pull-up Resistor
JTAG Reset
Register
FILTER
SPIKE
CKSEL[3:0]
Power-on Reset
Reset Circuit
SUT[1:0]
USB Reset
Watchdog
Brown-out
Detection
Oscillator
Generator
Circuit
Clock
CK
Register (MCUSR)
(1)
MCU Status
DATA BUS
Delay Counters
Condition
5V, 25°C
CC
is below the detection level. The
ATmega16/32U4
Min
-0.1
Vcc
0.3
0.2
TIMEOUT
Typ
400
1.4
1.3
POT
+0.1
Max
0.85
Vcc
2.3
2.3
(falling)
Units
V/ms
ns
V
V
V
V
50
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