ATMEGA8HVA-4CKU Atmel, ATMEGA8HVA-4CKU Datasheet - Page 85
ATMEGA8HVA-4CKU
Manufacturer Part Number
ATMEGA8HVA-4CKU
Description
MCU AVR 8K FLASH 4MHZ 36-LGA
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA16HVA-4CKU.pdf
(196 pages)
Specifications of ATMEGA8HVA-4CKU
Core Processor
AVR
Core Size
8-Bit
Speed
4MHz
Connectivity
SPI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
7
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 9 V
Data Converters
A/D 5x12b
Oscillator Type
External
Operating Temperature
-20°C ~ 85°C
Package / Case
36-LGA
Processor Series
ATMEGA8x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
512 B
Interface Type
SPI
Maximum Clock Frequency
4 MHz
Number Of Programmable I/os
6
Number Of Timers
2
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, ATAVRSB200, ATAVRSB201
Minimum Operating Temperature
- 20 C
On-chip Adc
12 bit, 5 Channel
For Use With
ATSTK600 - DEV KIT FOR AVR/AVR32ATSTK500 - PROGRAMMER AVR STARTER KIT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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17.7.1
17.7.2
17.8
8024A–AVR–04/08
Timer/Counter Timing Diagrams
Compare Match Blocking by TCNT0 Write
Using the Output Compare Unit
All CPU write operations to the TCNTnH/L Register will block any Compare Match that occur in
the next timer clock cycle, even when the timer is stopped. This feature allows OCRnB/A to be
initialized to the same value as TCNTn without triggering an interrupt when the Timer/Counter
clock is enabled.
Since writing TCNTnH/L will block all Compare Matches for one timer clock cycle, there are risks
involved when changing TCNTnH/L when using the Output Compare Unit, independently of
whether the Timer/Counter is running or not. If the value written to TCNTnH/L equals the
OCRnB/A value, the Compare Match will be missed.
The Timer/Counter is a synchronous design and the timer clock (clk
clock enable signal in the following figures. The figures include information on when Interrupt
Flags are set.
The figure shows the count sequence close to the MAX value.
Figure 17-6. Timer/Counter Timing Diagram, no Prescaling
Figure 17-7 on page 85
Figure 17-7. Timer/Counter Timing Diagram, with Prescaler (f
Figure 17-8 on page 86
TCNTn
TCNTn
(clk
(clk
TOVn
TOVn
clk
clk
clk
clk
I/O
I/O
I/O
Tn
I/O
Tn
/1)
/8)
Figure 17-6 on page 85
shows the same timing data, but with the prescaler enabled.
shows the setting of OCFnA and OCFnB in Normal mode.
MAX - 1
MAX - 1
contains timing data for basic Timer/Counter operation.
MAX
MAX
ATmega8HVA/16HVA
BOTTOM
BOTTOM
clk_I/O
/8)
Tn
) is therefore shown as a
BOTTOM + 1
BOTTOM + 1
85
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