ATMEGA128-16AU Atmel, ATMEGA128-16AU Datasheet - Page 39

• Manufacturer Part Number: ATMEGA128-16AU
• Description: IC AVR MCU 128K 16MHZ 5V 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA128-16AU

• 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): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• Processor Series: ATMEGA128x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: 2-Wire, JTAG, SPI, USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 53
• Number Of Timers: 4
• Operating Supply Voltage: 4.5 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• Controller Family/series: AVR MEGA
• No. Of I/o's: 53
• Eeprom Memory Size: 4096Byte
• Ram Memory Size: 4KB
• Cpu Speed: 16MHz
• Rohs Compliant: Yes
• For Use With: ATSTK600-TQFP64 - STK600 SOCKET/ADAPTER 64-TQFP770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1005 - ISP 4PORT FOR ATMEL AVR MCU JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPIATAVRISP2 - PROGRAMMER AVR IN SYSTEMATJTAGICE2 - AVR ON-CHIP D-BUG SYSTEMATSTK501 - ADAPTER KIT FOR 64PIN AVR MCUATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Calibrated Internal RC
Oscillator
Oscillator Calibration Register
– OSCCAL
2467M–AVR–11/04
The Calibrated Internal RC Oscillator provides a fixed 1.0, 2.0, 4.0, or 8.0 MHz clock. All
frequencies are nominal values at 5V and 25°C. This clock may be selected as the sys-
tem clock by programming the CKSEL fuses as shown in Table 13. If selected, it will
operate with no external components. The CKOPT fuse should always be unpro-
grammed when using this clock option. During Reset, hardware loads the calibration
byte for the 1MHz oscillator into the OSCCAL Register and thereby automatically cali-
brates the RC Oscillator. At 5V, 25°C and 1.0 MHz Oscillator frequency selected, this
calibration gives a frequency within ± 3% of the nominal frequency. Using calibration
methods as described in application notes available at www.atmel.com/avr it is possible
to achieve ± 1% accuracy at any given V
used as the chip clock, the Watchdog Oscillator will still be used for the Watchdog Timer
and for the Reset Time-out. For more information on the pre-programmed calibration
value, see the section “Calibration Byte” on page 291.
Table 13. Internal Calibrated RC Oscillator Operating Modes
Note:
When this Oscillator is selected, start-up times are determined by the SUT fuses as
shown in Table 14. XTAL1 and XTAL2 should be left unconnected (NC).
Table 14. Start-up Times for the Internal Calibrated RC Oscillator Clock Selection
Note:
Note:
• Bits 7..0 – CAL7..0: Oscillator Calibration Value
Writing the calibration byte to this address will trim the Internal Oscillator to remove pro-
cess variations from the Oscillator frequency. During Reset, the 1 MHz calibration value
which is located in the signature row high byte (address 0x00) is automatically loaded
into the OSCCAL Register. If the internal RC is used at other frequencies, the calibration
values must be loaded manually. This can be done by first reading the signature row by
a programmer, and then store the calibration values in the Flash or EEPROM. Then the
value can be read by software and loaded into the OSCCAL Register. When OSCCAL is
Bit
Read/Write
Initial Value
SUT1..0
10
00
01
11
(1)
1. The device is shipped with this option selected.
1. The device is shipped with this option selected.
OSCCAL Register is not available in ATmega103 compatibility mode.
Start-up Time from Power-
CKSEL3..0
0001
down and Power-save
CAL7
0010
0011
0100
R/W
7
(1)
6 CK
6 CK
6 CK
CAL6
R/W
6
CAL5
R/W
5
Device Specific Calibration Value
CAL4
R/W
Additional Delay from
4
Reset (V
CC
Reserved
and Temperature. When this Oscillator is
CAL3
R/W
4.1 ms
Nominal Frequency (MHz)
65 ms
3
CC
–
= 5.0V)
CAL2
R/W
2
1.0
2.0
4.0
8.0
CAL1
R/W
ATmega128
Recommended Usage
BOD enabled
Fast rising power
Slowly rising power
1
CAL0
R/W
0
OSCCAL
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