ATMEGA128A-MUR Atmel, ATMEGA128A-MUR Datasheet - Page 122
![MCU AVR 128K FLASH 16MHZ 64QFN](/photos/12/13/121326/313-64-qfn_sml.jpg)
ATMEGA128A-MUR
Manufacturer Part Number
ATMEGA128A-MUR
Description
MCU AVR 128K FLASH 16MHZ 64QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA128A-MUR
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
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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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
122
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