ATmega128A Atmel Corporation, ATmega128A Datasheet - Page 294

• Manufacturer Part Number: ATmega128A
• Manufacturer: Atmel Corporation

Specifications of ATmega128A

• Flash (kbytes): 128 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 53
• Ext Interrupts: 8
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 2
• 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: No
• Crypto Engine: No
• Sram (kbytes): 4
• Eeprom (bytes): 4096
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 8
• Input Capture Channels: 2
• Pwm Channels: 7
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

26.3
26.4
26.5
26.5.1
8151H–AVR–02/11
Signature Bytes
Calibration Byte
Parallel Programming Parameters, Pin Mapping, and Commands
Signal Names
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 ATmega128A the signature bytes are in
26-6.
Table 26-6.
The ATmega128A stores four different calibration values for the internal RC Oscillator. These
bytes resides in the signature row high byte of the addresses 0x000, 0x0001, 0x0002, and
0x0003 for 1MHz, 2MHz, 4MHz, and 8MHz respectively. During Reset, the 1MHz value is auto-
matically loaded into the OSCCAL Register. If other frequencies are used, the calibration value
has to be loaded manually, see “OSCCAL - Oscillator Calibration Register” on page 44 for
details.
This section describes how to parallel program and verify Flash Program memory, EEPROM
Data memory, Memory Lock bits, and Fuse bits in the ATmega128A. Pulses are assumed to be
at least 250 ns unless otherwise noted.
In this section, some pins of the ATmega128A are referenced by signal names describing their
functionality during parallel programming, see
the following table are referenced by pin names.
The XA1/XA0 pins determine the action executed when the XTAL1 pin is given a positive pulse.
The bit coding is shown in
When pulsing WR or OE, the command loaded determines the action executed. The different
Commands are shown in
Part
ATmega128A
Device and JTAG ID
0x000
0x1E
Signature Bytes Address
Table
Table
26-10.
0x001
26-9.
0x97
0x002
0x02
Figure 26-1
Part Number
and
9702
Table
26-7. Pins not described in
ATmega128A
JTAG
Manufacture ID
0x1F
Table
294