ATtiny25 Automotive Atmel Corporation, ATtiny25 Automotive Datasheet - Page 136

• Manufacturer Part Number: ATtiny25 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATtiny25 Automotive

• Flash (kbytes): 2 Kbytes
• Pin Count: 8
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 4
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 6
• Ext Interrupts: 6
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 4
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.12
• Eeprom (bytes): 128
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 125
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 5
• Pwm Channels: 6
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

21.2.1
136
ATtiny25/45/85
Latching of Fuses
Table 21-4.
Notes:
Table 21-5.
Notes:
The status of the Fuse bits is not affected by Chip Erase. Note that the Fuse bits are locked if
Lock bit1 (LB1) is programmed. Program the Fuse bits before programming the Lock bits.
The fuse values are latched when the device enters programming mode and changes of the
fuse values will have no effect until the part leaves Programming mode. This does not apply to
the EESAVE Fuse which will take effect once it is programmed. The fuses are also latched on
Power-up in Normal mode.
BODLEVEL2
BODLEVEL1
BODLEVEL0
Fuse Low Byte
CKDIV8
CKOUT
SUT1
SUT0
CKSEL3
CKSEL2
CKSEL1
CKSEL0
Fuse High Byte
1. See
2. DWEN must be unprogrammed when Lock Bit security is required.
3. The SPIEN Fuse is not accessible in SPI Programming mode.
4. See
5. See
6. When programming the RSTDISBL Fuse, High-voltage Serial programming has to be used to
1. See
2. The CKOUT Fuse allows the system clock to be output on PORTB4. See “Clock Output Buffer”
3. The default value of SUT1..0 results in maximum start-up time for the default clock source.
4. The default setting of CKSEL1..0 results in internal RC Oscillator @ 8.0 MHz. See
(2)
(1)
Fuses.
Memory Lock Bits” on page 134.
change fuses to perform further programming.
on page 30 for details.
See
on page 26
(5)
(5)
(5)
Fuse High Byte
Fuse Low Byte
“Alternate Functions of Port B” on page 54
“Watchdog Timer Control Register – WDTCR” on page 42
Table 8-2 on page 38
“System Clock Prescaler” on page 29
Table 6-7 on page 26
Bit No
Bit No
for details.
2
1
0
7
6
5
4
3
2
1
0
Description
Brown-out Detector trigger level
Brown-out Detector trigger level
Brown-out Detector trigger level
Description
Divide clock by 8
Clock Output Enable
Select start-up time
Select start-up time
Select Clock source
Select Clock source
Select Clock source
Select Clock source
for BODLEVEL Fuse decoding.
for details.
for details.
for description of RSTDISBL and DWEN
Default Value
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
Default Value
0 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
0 (programmed)
0 (programmed)
0 (programmed)
1 (unprogrammed)
0 (programmed)
for details.
See “Program And Data
(3)
(4)
(4)
(4)
7598H–AVR–07/09
(3)
(4)
Table 6-6