ATmega32U2 Atmel Corporation, ATmega32U2 Datasheet - Page 106
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ATmega32U2
Manufacturer Part Number
ATmega32U2
Description
Manufacturer
Atmel Corporation
Specifications of ATmega32U2
Flash (kbytes)
32 Kbytes
Pin Count
32
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
12
Hardware Qtouch Acquisition
No
Max I/o Pins
22
Ext Interrupts
20
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
1
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
2
Output Compare Channels
5
Input Capture Channels
1
Pwm Channels
4
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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15.9.3
15.9.4
15.9.5
15.9.6
7799D–AVR–11/10
TCNT0 – Timer/Counter Register
OCR0A – Output Compare Register A
OCR0B – Output Compare Register B
TIMSK0 – Timer/Counter Interrupt Mask Register
Table 15-9.
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 – Res: Reserved Bits
These bits are reserved bits and will always read as zero.
Bit
0x26 (0x46)
Read/Write
Initial Value
Bit
0x27 (0x47)
Read/Write
Initial Value
Bit
0x28 (0x48)
Read/Write
Initial Value
Bit
(0x6E)
Read/Write
Initial Value
CS02
1
1
1
1
CS01
0
0
1
1
Clock Select Bit Description (Continued)
R/W
R/W
R/W
R
7
0
7
0
7
0
7
–
0
CS00
0
1
0
1
R/W
R/W
R/W
R
6
–
0
6
0
6
0
6
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
/256 (From prescaler)
/1024 (From prescaler)
R/W
R/W
R/W
R
5
–
0
5
0
5
0
5
0
R/W
R/W
R/W
R
4
–
0
4
0
4
0
4
0
OCR0A[7:0]
OCR0B[7:0]
TCNT0[7:0]
ATmega8U2/16U2/32U2
R/W
R/W
R/W
R
3
–
0
3
0
3
0
3
0
OCIE0B
R/W
R/W
R/W
R/W
2
0
2
0
2
0
2
0
OCIE0A
R/W
R/W
R/W
R/W
1
0
1
0
1
0
1
0
TOIE0
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
TCNT0
OCR0A
OCR0B
TIMSK0
106
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