ATMEGA128A-MNR Atmel, ATMEGA128A-MNR Datasheet - Page 122

• Manufacturer Part Number: ATMEGA128A-MNR
• Description: IC MCU AVR 128K FLASH 64VQFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA128A-MNR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: EBI/EMI, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 128KB (64K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP
• Core: AVR8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

15.7
8151H–AVR–02/11
Output Compare Units
Register has been read. After a change of the edge, the Input Capture flag (ICFn) must be
cleared by software (writing a logical one to the I/O bit location). For measuring frequency only,
the clearing of the ICFn flag is not required (if an interrupt handler is used).
The 16-bit comparator continuously compares TCNTn with the Output Compare Register
(OCRnx). If TCNT equals OCRnx the comparator signals a match. A match will set the Output
Compare Flag (OCFnx) at the next timer clock cycle. If enabled (OCIEnx = 1), the output com-
pare flag generates an output compare interrupt. The OCFnx flag is automatically cleared when
the interrupt is executed. Alternatively the OCFnx flag can be cleared by software by writing a
logical one to its I/O bit location. The Waveform Generator uses the match signal to generate an
output according to operating mode set by the Waveform Generation mode (WGMn3:0) bits and
Compare Output mode (COMnx1:0) bits. The TOP and BOTTOM signals are used by the wave-
form generator for handling the special cases of the extreme values in some modes of operation
(See “Modes of Operation” on page
A special feature of output compare unit A allows it to define the Timer/Counter TOP value (that
is, counter resolution). In addition to the counter resolution, the TOP value defines the period
time for waveforms generated by the waveform generator.
Figure 15-4
bit names indicates the device number (n = n for Timer/Counter n), and the “x” indicates output
compare unit (A/B/C). The elements of the block diagram that are not directly a part of the output
compare unit are gray shaded.
Figure 15-4. Output Compare Unit, Block Diagram
shows a block diagram of the output compare unit. The small “n” in the register and
OCRnxH Buf. (8-bit)
OCRnxH (8-bit)
BOTTOM
OCRnx Buffer (16-bit Register)
TEMP (8-bit)
TOP
OCRnx (16-bit Register)
125.)
OCRnxL Buf. (8-bit)
OCRnxL (8-bit)
DATABUS
Waveform Generator
WGMn3:0
=
(16-bit Comparator )
(8-bit)
COMnx1:0
TCNTnH (8-bit)
OCFnx (Int.Req.)
TCNTn (16-bit Counter)
ATmega128A
TCNTnL (8-bit)
OCnx
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