ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 106
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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13.8.3
13.8.4
13.8.5
13.8.6
7766F–AVR–11/10
Timer/Counter Register – TCNT0
Output Compare Register A – OCR0A
Output Compare Register B – OCR0B
Timer/Counter Interrupt Mask Register – TIMSK0
Table 13-9.
If external pin modes are used for the Timer/Counter0, transitions on the T0 pin will clock the
counter even if the pin is configured as an output. This feature allows software control of the
counting.
The Timer/Counter Register gives direct access, both for read and write operations, to the
Timer/Counter unit 8-bit counter. Writing to the TCNT0 Register blocks (removes) the Compare
Match on the following timer clock. Modifying the counter (TCNT0) while the counter is running,
introduces a risk of missing a Compare Match between TCNT0 and the OCR0x Registers.
The Output Compare Register A contains an 8-bit value that is continuously compared with the
counter value (TCNT0). A match can be used to generate an Output Compare interrupt, or to
generate a waveform output on the OC0A pin.
The Output Compare Register B contains an 8-bit value that is continuously compared with the
counter value (TCNT0). A match can be used to generate an Output Compare interrupt, or to
generate a waveform output on the OC0B pin.
• Bits 7..3, 0 – Res: Reserved Bits
These bits are reserved bits and will always read as zero.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
CS02
1
1
1
1
CS01
0
0
1
1
7
TCNT0[7:0]
R/W
0
7
R/W
0
7
R/W
0
7
–
R
0
Clock Select Bit Description (Continued)
CS00
0
1
0
1
6
R/W
0
6
R/W
0
6
R/W
0
6
–
R
0
Description
clk
clk
External clock source on T0 pin. Clock on falling edge.
External clock source on T0 pin. Clock on rising edge.
I/O
I/O
5
R/W
0
5
R/W
0
5
R/W
0
5
–
R
0
/256 (From prescaler)
/1024 (From prescaler)
4
R/W
0
4
R/W
0
4
R/W
0
4
–
R
0
OCR0A[7:0]
OCR0B[7:0]
3
0
3
0
3
0
3
–
R
0
R/W
R/W
R/W
2
R/W
0
2
R/W
0
2
R/W
0
2
OCIE0B
R/W
0
1
R/W
0
1
R/W
0
1
R/W
0
1
OCIE0A
R/W
0
ATmega16/32U4
0
R/W
0
0
R/W
0
0
R/W
0
0
TOIE0
R/W
0
TCNT0
OCR0A
OCR0B
TIMSK0
106
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