ATMEGA8-16MUR Atmel, ATMEGA8-16MUR Datasheet - Page 31
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ATMEGA8-16MUR
Manufacturer Part Number
ATMEGA8-16MUR
Description
MCU AVR 8KB FLASH 16MHZ 32QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8-16MUR
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
23
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
4.5 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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Oscillator Calibration
Register – OSCCAL
2486Z–AVR–02/11
• Bits 7..0 – CAL7..0: Oscillator Calibration Value
Writing the calibration byte to this address will trim the Internal Oscillator to remove process vari-
ations from the Oscillator frequency. During Reset, the 1MHz calibration value which is located
in the signature row High byte (address 0x00) is automatically loaded into the OSCCAL Regis-
ter. If the internal RC is used at other frequencies, the calibration values must be loaded
manually. This can be done by first reading the signature row by a programmer, and then store
the calibration values in the Flash or EEPROM. Then the value can be read by software and
loaded into the OSCCAL Register. When OSCCAL is zero, the lowest available frequency is
chosen. Writing non-zero values to this register will increase the frequency of the Internal Oscil-
lator. Writing 0xFF to the register gives the highest available frequency. The calibrated Oscillator
is used to time EEPROM and Flash access. If EEPROM or Flash is written, do not calibrate to
more than 10% above the nominal frequency. Otherwise, the EEPROM or Flash write may fail.
Note that the Oscillator is intended for calibration to 1.0MHz, 2.0MHz, 4.0MHz, or 8.0MHz. Tun-
ing to other values is not guaranteed, as indicated in
Table 11. Internal RC Oscillator Frequency Range
Bit
Read/Write
Initial Value
OSCCAL Value
0xFF
0x00
0x7F
CAL7
R/W
7
Min Frequency in Percentage of
CAL6
R/W
6
Nominal Frequency (%)
CAL5
R/W
5
Device Specific Calibration Value
100
50
75
CAL4
R/W
4
CAL3
R/W
3
Table
Max Frequency in Percentage of
CAL2
R/W
2
Nominal Frequency (%)
11.
CAL1
R/W
1
100
150
200
CAL0
R/W
ATmega8(L)
0
OSCCAL
31
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