ATMEGA128A-ANR Atmel, ATMEGA128A-ANR Datasheet - Page 113

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

Specifications of ATMEGA128A-ANR

• 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

15.2.1
8151H–AVR–02/11
Registers
Figure 15-1. 16-bit Timer/Counter Block Diagram
Note:
The Timer/Counter (TCNTn), Output Compare Registers (OCRnA/B/C), and Input Capture Reg-
ister (ICRn) are all 16-bit registers. Special procedures must be followed when accessing the 16-
bit registers. These procedures are described in the section
page
CPU access restrictions. Interrupt requests (shorten as Int.Req.) signals are all visible in the
Timer Interrupt Flag Register (TIFR) and Extended Timer Interrupt Flag Register (ETIFR). All
interrupts are individually masked with the Timer Interrupt Mask Register (TIMSK) and Extended
Timer Interrupt Mask Register (ETIMSK). (E)TIFR and (E)TIMSK are not shown in the figure
since these registers are shared by other timer units.
The Timer/Counter can be clocked internally, via the prescaler, or by an external clock source on
the Tn pin. The Clock Select logic block controls which clock source and edge the Timer/Counter
uses to increment (or decrement) its value. The Timer/Counter is inactive when no clock source
is selected. The output from the clock select logic is referred to as the timer clock (clk
115. The Timer/Counter Control Registers (TCCRnA/B/C) are 8-bit registers and have no
Refer to
Timer/Counter1 and 3 pin placement and description.
Figure 1-1 on page
Timer/Counter
TCCRxA
OCRxA
OCRxB
OCRxC
TCNTx
ICRx
=
=
=
2,
Direction
Count
Clear
Table 12-5 on page
Control Logic
TOP
=
TCCRxB
Values
BOTTOM
Fixed
TOP
ICFx (Int.Req.)
TCLK
Detector
Edge
=
0
74, and
Table 12-14 on page 81
“Accessing 16-bit Registers” on
OCFxA
(Int.Req.)
OCFxB
(Int.Req.)
OCFxC
(Int.Req.)
TOVx
(Int.Req.)
Clock Select
Generation
Generation
Generation
( From Prescaler )
Waveform
Waveform
Waveform
Canceler
TCCRxC
Detector
Noise
Edge
ATmega128A
Comparator Ouput )
( From Analog
OCxA
OCxB
OCxC
ICPx
Tx
for
T
n
).
113