ATMEGA128A-ANR Atmel, ATMEGA128A-ANR Datasheet - Page 43

• Manufacturer Part Number: ATMEGA128A-ANR
• Description: IC MCU AVR 128K FLASH 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA128A-ANR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: EBI/EMI, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 128KB (64K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP
• Core: AVR8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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