ATtiny28L Atmel Corporation, ATtiny28L Datasheet - Page 9

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ATtiny28L

Manufacturer Part Number
ATtiny28L
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of ATtiny28L

Flash (kbytes)
2 Kbytes
Pin Count
28
Max. Operating Frequency
4 MHz
Cpu
8-bit AVR
Hardware Qtouch Acquisition
No
Max I/o Pins
11
Ext Interrupts
10
Usb Speed
No
Usb Interface
No
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
0.03
Self Program Memory
NO
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
1
32khz Rtc
No
Calibrated Rc Oscillator
Yes
Register Description
Oscillator Calibration Register
– OSCCAL
1062F–AVR–07/06
Bit
7
6
5
$00
CAL7
CAL6
CAL5
Read/Write
R/W
R/W
R/W
Initial Value
0
0
0
• 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
OSCCAL Value
Min Frequency
0x00
0.6 MHz
0x7F
0.8 MHz
0xFF
1.2 MHz
ATtiny28L/V
4
3
2
1
CAL4
CAL3
CAL2
CAL1
CAL0
R/W
R/W
R/W
R/W
R/W
0
0
0
0
Max Frequency
1.2 MHz
1.7 MHz
2.5 MHz
0
OSCCAL
0
o
C,
9

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