ATTINY12-8SU Atmel, ATTINY12-8SU Datasheet - Page 12

• Manufacturer Part Number: ATTINY12-8SU
• Description: Microcontrollers (MCU) AVR 1K FLASH 64B EE 5V 8MHZ
• Manufacturer: Atmel

Specifications of ATTINY12-8SU

• Processor Series: ATTINY1x
• Core: AVR8
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 1 KB
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 6
• Number Of Timers: 1
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500
• Minimum Operating Temperature: - 40 C
• Cpu Family: ATtiny
• Device Core: AVR
• Device Core Size: 8b
• Frequency (max): 8MHz
• Interface Type: SPI
• # I/os (max): 6
• Number Of Timers - General Purpose: 1
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4V
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 8
• Package Type: SOIC EIAJ
• Lead Free Status / Rohs Status: Details

Register Description
Oscillator Calibration Register
– OSCCAL
12
ATtiny11/12
• Bits 7..0 - CAL7..0: Oscillator Calibration Value
Writing the calibration byte to this address will trim the internal oscillator to remove pro-
cess variations from the oscillator frequency. When OSCCAL is zero, the lowest
available frequency is chosen. Writing non-zero values to this register will increase the
frequency of the internal oscillator. Writing $FF to the register gives the highest available
frequency. The calibrated oscillator is used to time EEPROM access. If EEPROM is
written, do not calibrate to more than 10% above the nominal frequency. Otherwise, the
EEPROM write may fail. Table 4 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.
Table 4. Internal RC Oscillator Frequency Range
Bit
$31
Read/Write
Initial Value
OSCCAL Value
$7F
$FF
$00
CAL7
R/W
7
0
CAL6
R/W
6
0
CAL5
R/W
5
0
Min Frequency
CAL4
R/W
0.6 MHz
0.8 MHz
1.2 MHz
4
0
CAL3
R/W
3
0
CAL2
R/W
2
0
CAL1
R/W
1
0
Max Frequency
1.2 MHz
1.7 MHz
2.5 MHz
CAL0
R/W
0
0
1006F–AVR–06/07
OSCCAL