ATMEGA32A-MUR Atmel, ATMEGA32A-MUR Datasheet - Page 32
![MCU AVR 32KB FLASH 16MHZ 44QFN](/photos/12/13/121316/313-44-qfn_sml.jpg)
ATMEGA32A-MUR
Manufacturer Part Number
ATMEGA32A-MUR
Description
MCU AVR 32KB FLASH 16MHZ 44QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA32A-MU.pdf
(353 pages)
Specifications of ATMEGA32A-MUR
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
32
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K 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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8.10
8.10.1
8155C–AVR–02/11
Register Description
OSCCAL – Oscillator Calibration Register
• 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 $FF 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 1.0, 2.0z, 4.0, or 8.0MHz. Tuning to other
values is not guaranteed, as indicated in
Table 8-11.
Bit
Read/Write
Initial Value
OSCCAL Value
$FF
$00
$7F
Internal RC Oscillator Frequency Range.
CAL7
R/W
7
Min Frequency in Percentage of
CAL6
R/W
6
Nominal Frequency (%)
CAL5
R/W
5
100
50
75
Device Specific Calibration Value
Table
CAL4
R/W
4
8-11.
CAL3
R/W
3
CAL2
Max Frequency in Percentage of
R/W
2
Nominal Frequency (%)
CAL1
R/W
1
ATmega32A
100
150
200
CAL0
R/W
0
OSCCAL
32
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