ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 162
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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15.12 Register Description
15.12.1
7766F–AVR–11/10
TCCR4A – Timer/Counter4 Control Register A
• Bits 7,6 - COM4A1, COM4A0: Comparator A Output Mode, Bits 1 and 0
These bits control the behavior of the Waveform Output (OCW4A) and the connection of the
Output Compare pin (OC4A). If one or both of the COM4A1:0 bits are set, the OC4A output
overrides the normal port functionality of the I/O pin it is connected to. The complementary
OC4B output is connected only in PWM modes when the COM4A1:0 bits are set to “01”. Note
that the Data Direction Register (DDR) bit corresponding to the OC4A and OC4A pins must be
set in order to enable the output driver.
The function of the COM4A1:0 bits depends on the PWM4A, WGM40 and WGM41 bit settings.
Table 15-6
(non-PWM).
Table 15-6.
Table 15-7
are set to fast PWM mode.
Table 15-7.
Bit
Read/Write
Initial value
COM4A1..0
COM4A1..0
00
01
10
11
00
01
10
11
shows the COM4A1:0 bit functionality when the PWM4A, WGM40 and WGM41 bits
shows the COM4A1:0 bit functionality when the PWM4A bit is set to Normal Mode
COM4A1
Compare Output Mode, Normal Mode (non-PWM)
Compare Output Mode, Fast PWM Mode
R/W
OCW4A Behavior
Normal port operation.
Toggle on Compare Match.
Clear on Compare Match.
Set on Compare Match.
OCW4A Behavior
Normal port operation.
Cleared on Compare Match.
Set when TCNT4 = 0x000.
Cleared on Compare Match.
Set when TCNT4 = 0x000.
Set on Compare Match.
Cleared when TCNT4 = 0x000.
7
0
COM4A0
R/W
6
0
COM4B1
R/W
5
0
COM4B0
R/W
4
0
FOC4A
W
3
0
FOC4B
W
2
0
ATmega16/32U4
Disconnected
Disconnected
Connected
Connected
Connected
Connected
Connected
Connected
OC4A Pin
OC4A
PWM4A
R/W
1
0
PWM4B
R/W
0
0
Disconnected
Disconnected
Disconnected
Disconnected
Disconnected
Disconnected
Disconnected
Connected
OC4A Pin
OC4A
TCCR4A
162
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