ATTINY28V-1AC Atmel, ATTINY28V-1AC Datasheet - Page 9

• Manufacturer Part Number: ATTINY28V-1AC
• Description: IC AVR MCU 2K 1.2MHZ 1.8V 32TQFP
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY28V-1AC

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 1.2MHz
• Peripherals: POR, WDT
• Number Of I /o: 11
• Program Memory Size: 2KB (1K x 16)
• Program Memory Type: FLASH
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 32-TQFP, 32-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Ram Size: -
• Data Converters: -
• Connectivity: -

Register Description
Oscillator Calibration Register
– OSCCAL
1062F–AVR–07/06
• Bits 7..0 – CAL7..CAL0: Oscillator Calibration Value
Writing the calibration byte to this address will trim the internal oscillator to remove pro-
cess variation from the oscillator frequency. When OSCCAL is zero, the lowest available
frequency is chosen. Writing non-zero values to the register will increase the frequency
to the internal oscillator. Writing $FF to the register gives the highest available fre-
quency. Table 2 shows the range for OSCCAL. Note that the oscillator is intended for
calibration to 1.2 MHz, thus tuning to other values is not guaranteed. At 3V and 25
the pre-programmed calibration byte gives a frequency within ± 1% of the nominal
frequency.
Table 2. Internal RC Oscillator Range
Bit
$00
Read/Write
Initial Value
OSCCAL Value
0x00
0x7F
0xFF
CAL7
R/W
7
0
CAL6
R/W
6
0
Min Frequency
0.6 MHz
0.8 MHz
1.2 MHz
CAL5
R/W
5
0
CAL4
R/W
4
0
CAL3
R/W
3
0
CAL2
R/W
2
0
Max Frequency
1.2 MHz
1.7 MHz
2.5 MHz
CAL1
ATtiny28L/V
R/W
1
0
CAL0
R/W
0
0
OSCCAL
o
C,
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