ATMEGA16U4-AU Atmel, ATMEGA16U4-AU Datasheet - Page 141

• Manufacturer Part Number: ATMEGA16U4-AU
• Description: MCU AVR 16K FLASH USB 44TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA16U4-AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 26
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Processor Series: ATMEGA16x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 1.25 KB
• Interface Type: SPI, TWI, USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 26
• Number Of Timers: 5
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 12 Channel
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32ATAVRDRAGON - KIT DRAGON 32KB FLASH MEM AVRATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

15.2.5
7766F–AVR–11/10
Definitions
Figure 15-2. Timer/Counter4 Synchronization Register Block Diagram.
Many register and bit references in this section are written in general form. A lower case “n”
replaces the Timer/Counter number, in this case 0. A lower case “x” replaces the Output Com-
pare Unit, in this case Compare Unit A, B, C or D. However, when using the register or bit
defines in a program, the precise form must be used, i.e., TCNT4 for accessing Timer/Counter4
counter value and so on. The definitions in
document.
Table 15-1.
BOTTOM
MAX
TOP
PLLTM1:0
CK
PCK
(clk
SYNC
MODE
ASYNC
MODE
!= '00'
TMR
IO-registers
)
The counter reaches the BOTTOM when it becomes 0.
The counter reaches its MAXimum value when it becomes 0x3FF (decimal 1023).
The counter reaches the TOP value (stored in the OCR1C) when it becomes equal to the
highest value in the count sequence. The TOP has a value 0x0FF as default after reset.
OCR4B
OCF4A
OCR4A
OCR4C
OCR4D
TCCR4A
TCCR4B
TCCR4C
TCCR4D
TCNT4
TC4H
OCF4B
OCF4D
TOV4
Definitions
~1/2 CK Delay
1/2 CK Delay
S
A
Input synchronization
registers
OCR4A_SI
OCR4B_SI
OCR4C_SI
OCR4D_SI
TCCR4A_SI
TCCR4B_SI
TCCR4C_SI
TCCR4D_SI
TCNT4_SI
TC4H_SI
OCF4A_SI
OCF4B_SI
OCF4D_SI
TOV4_SI
1 PCK Delay
1 CK Delay
Table 15-1
S
A
8-BIT DATABUS
Timer/Counter4
TCNT4
are used extensively throughout the
1 CK Delay
1 PCK Delay
ATmega16/32U4
Output synchronization
registers
TCNT4_SO
TC4H_SO
OCF4A_SO
OCF4B_SO
OCF4D_SO
TOV4_SO
1/2 CK Delay
~1 CK Delay
TCNT4
TC4H
OCF4
OCF4B
OCF4D
TOV4
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