ATMEGA16U2-16AU Atmel, ATMEGA16U2-16AU Datasheet - Page 129

• Manufacturer Part Number: ATMEGA16U2-16AU
• Description: 8-bit Microcontrollers - MCU 16K Flash
• Manufacturer: Atmel

Specifications of ATMEGA16U2-16AU

• Product Category: 8-bit Microcontrollers - MCU
• Rohs: yes
• Core: AVR
• Data Bus Width: 8 bit
• Program Memory Size: 16 KB
• Data Ram Size: 1.25 KB
• Data Rom Size: 512 B
• Program Memory Type: Flash
• Factory Pack Quantity: 1250

16.11 Register Description
16.11.1
7799D–AVR–11/10
TCCR1A – Timer/Counter1 Control Register A
Figure 16-13. Timer/Counter Timing Diagram, with Prescaler (f
•
•
•
The COMnA[1:0], COMnB[1:0], and COMnC[1:0] control the output compare pins (OCnA,
OCnB, and OCnC respectively) behavior. If one or both of the COMnA[1:0] bits are written to
one, the OCnA output overrides the normal port functionality of the I/O pin it is connected to. If
one or both of the COMnB[1:0] bits are written to one, the OCnB output overrides the normal
port functionality of the I/O pin it is connected to. If one or both of the COMnC[1:0] bits are writ-
ten to one, the OCnC output overrides the normal port functionality of the I/O pin it is connected
to. However, note that the Data Direction Register (DDR) bit corresponding to the OCnA, OCnB
or OCnC pin must be set in order to enable the output driver.
When the OCnA, OCnB or OCnC is connected to the pin, the function of the COMnx[1:0] bits is
dependent of the WGMn[3:0] bits setting.
when the WGMn[3:0] bits are set to a normal or a CTC mode (non-PWM).
and ICF n
Bit
(0x80)
Read/Write
Initial Value
Bit 7:6 – COMnA1:0: Compare Output Mode for Channel A
Bit 5:4 – COMnB1:0: Compare Output Mode for Channel B
Bit 3:2 – COMnC1:0: Compare Output Mode for Channel C
(PC and PFC PWM)
TOVn
(CTC and FPWM)
(Update at TOP)
TCNTn
TCNTn
as TOP)
OCRnx
(clk
clk
clk
I/O
(FPWM)
I/O
Tn
/8)
(if used
COM1A1
R/W
7
0
COM1A0
TOP - 1
TOP - 1
R/W
6
0
Old OCRnx Value
COM1B1
R/W
5
0
COM1B0
TOP
TOP
R/W
Table 16-1
4
0
ATmega8U2/16U2/32U2
COM1C1
R/W
3
0
shows the COMnx[1:0] bit functionality
BOTTOM
TOP - 1
COM1C0
New OCRnx Value
R/W
2
0
clk_I/O
/8)
WGM11
BOTTOM + 1
R/W
1
0
TOP - 2
WGM10
R/W
0
0
TCCR1A
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