ATtiny48 Atmel Corporation, ATtiny48 Datasheet - Page 193

• 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

21.2.1
21.2.2
8008H–AVR–04/11
Enter Programming Mode
Considerations for Efficient Programming
When pulsing WR or OE, the command loaded determines the action executed. The different
Commands are shown in
Table 21-6.
The following algorithm puts the device in Parallel (High-voltage) Programming mode:
If the rise time of the V
tive algorithm can be used.
The loaded command and address are retained in the device during programming. For efficient
programming, the following should be considered.
1. Set Prog_enable pins listed in
2. Apply 4.5 – 5.5V between V
3. Wait 20 – 60 µs, and apply 11.5 – 12.5V to RESET.
4. Keep the Prog_enable pins unchanged for at least 10µs after the High-voltage has
5. Wait at least 300 µs before giving any parallel programming commands.
6. Exit Programming mode by power the device down or by bringing RESET pin to 0V.
1. Set Prog_enable pins listed in
2. Apply 4.5 – 5.5V between V
3. Monitor V
4. Keep the Prog_enable pins unchanged for at least 10µs after the High-voltage has
5. Wait until V
6. Exit Programming mode by power the device down or by bringing RESET pin to 0V.
Command Byte
1000 0000
0100 0000
0010 0000
0001 0000
0001 0001
0000 1000
0000 0100
0000 0010
0000 0011
V
the next 20 µs.
been applied to ensure the Prog_enable Signature has been latched.
V
been applied to ensure the Prog_enable Signature has been latched.
commands.
CC
CC
to 0V.
to 0V.
Command Byte Bit Coding
CC
CC
, and as soon as V
actually reaches 4.5 -5.5V before giving any parallel programming
Command Executed
Chip Erase
Write Fuse bits
Write Lock bits
Write Flash
Write EEPROM
Read Signature Bytes and Calibration byte
Read Fuse and Lock bits
Read Flash
Read EEPROM
CC
Table
is unable to fulfill the requirements listed above, the following alterna-
21-6.
CC
CC
Table 21-4 on page 192
Table 21-4 on page 192
CC
and GND. Ensure that V
and GND.
reaches 0.9 – 1.1V, apply 11.5 – 12.5V to RESET.
to “0000”, RESET pin to 0V and
to “0000”, RESET pin to 0V and
CC
reaches at least 1.8V within
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