ATMEGA8HVA-4TU Atmel, ATMEGA8HVA-4TU Datasheet - Page 31
![MCU AVR 8K FLASH 4MHZ 28-TSOP](/photos/7/21/72191/313-28-tsop_sml.jpg)
ATMEGA8HVA-4TU
Manufacturer Part Number
ATMEGA8HVA-4TU
Description
MCU AVR 8K FLASH 4MHZ 28-TSOP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA16HVA-4CKU.pdf
(196 pages)
Specifications of ATMEGA8HVA-4TU
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
28-TSOP
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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- Download datasheet (3Mb)
9.13.2
9.13.3
8024A–AVR–04/08
MCUCR – MCU Control Register
CLKPR – Clock Prescale Register
The FCAL[4:0] bits are used to tune the frequency within the selected range. A setting of 0x00
gives the lowest frequency in that range, and a setting of 0x1F gives the highest frequency in the
range. Incrementing FCAL[4:0] by 1 will give a frequency increment of less than 1.5 % in the fre-
quency range 7.3-8.1 MHz. With an accurate time reference, an oscillator accuracy of ±1% can
be achieved after calibration. The frequency will drift with temperature, so run-time calibration
will be required to maintain the accuracy. Refer to
28
The default FOSCCAL value found in the signature row, is selected such that it is in the the
lower half of a segment (see
oscillator). It is therefore sufficient to use the default segment and the one below to calibrate the
frequency over the whole temperature range. To avoid a large frequency change when shifting
between the two segments, a FOSC SEGMENT value is stored in the signature row. This is the
first FOSCCAL value giving a lower frequency than the lowest value in the default segment, and
should be used when calibrating the Fast RC oscillator.
• Bit 5 – CKOE: Clock Output
When this bit is written to one, the CPU clock divided by 2 is output on the PB0 pin.
Bit
0x35 (0x55)
Read/Write
Initial Value
Bit
(0x61)
Read/Write
Initial Value
for details.
CLKPCE
-–
R
7
0
R/W
7
0
R
6
–
0
R
6
–
0
Figure 30-1 on page 174
CKOE
R/W
5
0
R
5
–
0
PUD
R/W
4
0
R
4
–
0
”OSI – Oscillator Sampling Interface” on page
R
3
–
0
R
3
–
0
for typical characteristics of the FAST RC
ATmega8HVA/16HVA
R
2
–
0
R
2
–
0
R
1
–
0
CLKPS1
R/W
1
1
R
0
–
0
CLKPS0
R/W
MCUCR
0
1
CLKPR
31
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