ATmega128A Atmel Corporation, ATmega128A Datasheet - Page 43

• 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

8.8
8151H–AVR–02/11
External Clock
Watchdog Timer and for the Reset Time-out. For more information on the pre-programmed cali-
bration value, see the section
Table 8-8.
Note:
When this Oscillator is selected, start-up times are determined by the SUT fuses as shown in
Table
Table 8-9.
Notes:
To drive the device from an external clock source, XTAL1 should be driven as shown in
8-4. To run the device on an external clock, the CKSEL fuses must be programmed to “0000”.
By programming the CKOPT fuse, the user can enable an internal 36pF capacitor between
XTAL1 and GND.
Figure 8-4.
SUT1:0
10
00
01
11
(1)
8-9. XTAL1 and XTAL2 should be left unconnected (NC).
1. The device is shipped with this option selected.
1. The device is shipped with this option selected.
Start-up Time from Power-
CKSEL3:0
0001
down and Power-save
0010
0011
0100
Internal Calibrated RC Oscillator Operating Modes
Start-up Times for the Internal Calibrated RC Oscillator Clock Selection
External Clock Drive Configuration
(1)
6 CK
6 CK
6 CK
“Calibration Byte” on page
EXTERNAL
SIGNAL
CLOCK
Additional Delay from
Reset (V
Reserved
Nominal Frequency (MHz)
4.1ms
65ms
CC
–
= 5.0V)
294.
1.0
2.0
4.0
8.0
Recommended Usage
BOD enabled
Fast rising power
Slowly rising power
ATmega128A
Figure
43