ATmega16U4 Atmel Corporation, ATmega16U4 Datasheet - Page 172
ATmega16U4
Manufacturer Part Number
ATmega16U4
Description
Manufacturer
Atmel Corporation
Specifications of ATmega16U4
Flash (kbytes)
16 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)
2.1
Eeprom (bytes)
512
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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15.12.11 OCR4D – Timer/Counter4 Output Compare Register D
15.12.12 TIMSK4 – Timer/Counter4 Interrupt Mask Register
7766F–AVR–11/10
The output compare register C is an 8-bit read/write register.
The Timer/Counter Output Compare Register C contains data to be continuously compared with
Timer/Counter4, and a compare match will clear TCNT4. This register has the same function in
Normal mode and PWM modes.
Note that, if a smaller value than three is written to the Output Compare Register C, the value is
automatically replaced by three as it is a minimum value allowed to be written to this register.
Note that, if 10-bit accuracy is used special procedures must be followed when accessing the
internal 10-bit Output Compare Registers via the 8-bit AVR data bus. These procedures are
described in section
The output compare register D is an 8-bit read/write register.
The Timer/Counter Output Compare Register D contains data to be continuously compared with
Timer/Counter4. Actions on compare matches are specified in TCCR4A. A compare match does
only occur if Timer/Counter4 counts to the OCR4D value. A software write that sets TCNT4 and
OCR4D to the same value does not generate a compare match.
A compare match will set the compare interrupt flag OCF4D after a synchronization delay follow-
ing the compare event.
Note that, if 10-bit accuracy is used special procedures must be followed when accessing the
internal 10-bit Output Compare Registers via the 8-bit AVR data bus. These procedures are
described in section
• Bit 7- OCIE4D: Timer/Counter4 Output Compare Interrupt Enable
When the OCIE4D bit is set (one) and the I-bit in the Status Register is set (one), the
Timer/Counter4 Compare Match D interrupt is enabled. The corresponding interrupt at vector
$010 is executed if a compare match D occurs. The Compare Flag in Timer/Counter4 is set
(one) in the Timer/Counter Interrupt Flag Register.
• Bit 6 - OCIE4A: Timer/Counter4 Output Compare Interrupt Enable
When the OCIE4A bit is set (one) and the I-bit in the Status Register is set (one), the
Timer/Counter4 Compare Match A interrupt is enabled. The corresponding interrupt at vector
$003 is executed if a compare match A occurs. The Compare Flag in Timer/Counter4 is set
(one) in the Timer/Counter Interrupt Flag Register.
Bit
Read/Write
Initial value
Bit
Read/Write
Initial value
OCIE4D
MSB
R/W
R/W
7
0
7
0
“Accessing 10-Bit Registers” on page
“Accessing 10-Bit Registers” on page
OCIE4A
R/W
R/W
6
0
6
0
OCIE4B
R/W
R/W
5
0
5
0
R/W
R/W
4
0
4
0
R/W
R/W
3
0
3
0
159.
159.
TOIE4
R/W
R/W
2
0
2
0
ATmega16/32U4
R/W
R/W
1
0
1
0
LSB
R/W
R/W
0
0
0
0
TIMSK4
OCR4D
172
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