ATtiny48 Atmel Corporation, ATtiny48 Datasheet - Page 190

• Manufacturer Part Number: ATtiny48
• Manufacturer: Atmel Corporation

Specifications of ATtiny48

• Flash (kbytes): 4 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 12 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 28
• Ext Interrupts: 28
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.25
• Eeprom (bytes): 64
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• 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: 2
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 2
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

20.2.1
20.3
20.4
190
Signature Bytes
Calibration Byte
ATtiny48/88
Latching of Fuses
Table 20-5.
Note:
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.
All Atmel microcontrollers have a three-byte signature code which identifies the device. This
code can be read in both serial and parallel mode, also when the device is locked. The three
bytes reside in a separate address space. For the ATtiny48/88 the signature bytes are given in
Table
Table 20-6.
The ATtiny48/88 has a byte calibration value for the internal oscillator. This byte resides in the
high byte of address 0x000 in the signature address space. During reset, this byte is automati-
cally written into the OSCCAL Register to ensure correct frequency of the calibrated oscillator.
Fuse Low Byte
CKDIV8
CKOUT
SUT1
SUT0
-
-
CKSEL1
CKSEL0
Part
ATtiny48
ATtiny88
20-6.
1. The default value of SUT[1:0] results in maximum start-up time for the default clock source.
2. The default setting of CKSEL[1:0] results in internal oscillator @ 8 MHz. See
3. The CKOUT Fuse allows the system clock to be output on PORTB0. See
4. See
(3)
(4)
See
page 29
on page 32
Fuse Low Byte
Device ID
Table 6-3 on page 31
“System Clock Prescaler” on page 31
for details.
for details.
Bit No
7
6
5
4
3
2
1
0
for details.
Signature Bytes Address
0x000
0x1E
0x1E
Description
Divide clock by 8
Clock output
Select start-up time
Select start-up time
-
-
Select Clock source
Select Clock source
for details.
0x001
0x92
0x93
Default Value
0 (programmed)
1 (unprogrammed)
1 (unprogrammed)
0 (programmed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
0 (programmed)
“Clock Output Buffer”
0x002
0x09
0x11
Table 6-1 on
8008H–AVR–04/11
(1)
(2)
(1)
(2)
(2)
(2)