ATMEGA128A-ANR Atmel, ATMEGA128A-ANR Datasheet - Page 40

• 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

8151H–AVR–02/11
capacitance, and the electromagnetic noise of the environment. Some initial guidelines for
choosing capacitors for use with crystals are given in
capacitor values given by the manufacturer should be used.
Figure 8-2.
The Oscillator can operate in three different modes, each optimized for a specific frequency
range. The operating mode is selected by the fuses CKSEL3:1 as shown in
Table 8-3.
Note:
The CKSEL0 fuse together with the SUT1:0 fuses select the start-up times as shown in
4.
Table 8-4.
CKOPT
CKSEL0
1
1
1
0
0
0
0
0
1
1. This option should not be used with crystals, only with ceramic resonators.
101, 110, 111
SUT1:0
CKSEL3:1
Crystal Oscillator Connections
Crystal Oscillator Operating Modes
Start-up Times for the Crystal Oscillator Clock Selection
00
01
10
11
00
101
110
111
(1)
Power-down and Power-
Start-up Time from
Frequency Range
258 CK
258 CK
1K CK
1K CK
1K CK
save
0.4 - 0.9
0.9 - 3.0
3.0 - 8.0
(MHz)
C2
C1
1.0 -
(2)
(2)
(2)
(1)
(1)
from Reset (V
Additional Delay
Recommended Range for Capacitors C1
Table
4.1ms
4.1ms
5.0V)
65ms
65ms
XTAL2
XTAL1
GND
–
and C2 for Use with Crystals
8-3. For ceramic resonators, the
CC
=
12 - 22pF
12 - 22pF
12 - 22pF
ATmega128A
Recommended Usage
Ceramic resonator, fast
rising power
Ceramic resonator, slowly
rising power
Ceramic resonator, BOD
enabled
Ceramic resonator, fast
rising power
Ceramic resonator, slowly
rising power
–
Table
8-3.
Table 8-
40