ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 134
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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14.10.7
14.10.8
14.10.9
14.10.10 Output Compare Register 1 B – OCR1BH and OCR1BL
14.10.11 Output Compare Register 1 C – OCR1CH and OCR1CL
7766F–AVR–11/10
Timer/Counter1 – TCNT1H and TCNT1L
Timer/Counter3 – TCNT3H and TCNT3L
Output Compare Register 1 A – OCR1AH and OCR1AL
The two Timer/Counter I/O locations (TCNTnH and TCNTnL, combined TCNTn) give direct
access, both for read and for write operations, to the Timer/Counter unit 16-bit counter. To
ensure that both the high and low bytes are read and written simultaneously when the CPU
accesses these registers, the access is performed using an 8-bit temporary High Byte Register
(TEMP). This temporary register is shared by all the other 16-bit registers.
Registers” on page 110.
Modifying the counter (TCNTn) while the counter is running introduces a risk of missing a com-
pare match between TCNTn and one of the OCRnx Registers.
Writing to the TCNTn Register blocks (removes) the compare match on the following timer clock
for all compare units.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
7
TCNT1[15:8]
TCNT1[7:0]
R/W
0
7
TCNT3[15:8]
TCNT3[7:0]
R/W
0
7
R/W
0
7
R/W
0
7
R/W
0
6
R/W
0
6
R/W
0
6
R/W
0
6
R/W
0
6
R/W
0
5
R/W
0
5
R/W
0
5
R/W
0
5
R/W
0
5
R/W
0
4
R/W
0
4
R/W
0
4
R/W
0
4
R/W
0
4
R/W
0
OCR1A[15:8]
OCR1B[15:8]
OCR1C[15:8]
OCR1A[7:0]
OCR1B[7:0]
OCR1C[7:0]
3
0
3
0
3
0
3
0
3
0
R/W
R/W
R/W
R/W
R/W
2
R/W
0
2
R/W
0
2
R/W
0
2
R/W
0
2
R/W
0
1
R/W
0
1
R/W
0
1
R/W
0
1
R/W
0
1
R/W
0
ATmega16/32U4
0
R/W
0
0
R/W
0
0
R/W
0
0
R/W
0
0
R/W
0
See “Accessing 16-bit
TCNT1H
TCNT1L
TCNT3H
TCNT3L
OCR1AH
OCR1AL
OCR1BH
OCR1BL
OCR1CH
OCR1CL
134
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