ATMEGA128A-MU Atmel, ATMEGA128A-MU Datasheet - Page 50

• Manufacturer Part Number: ATMEGA128A-MU
• Description: MCU 8BIT 128K ISP FLASH 64-QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA128A-MU

• 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-MLF®, 64-QFN
• Processor Series: ATMEGA128x
• Core: AVR8
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Controller Family/series: AVR MEGA
• No. Of I/o's: 53
• Eeprom Memory Size: 4KB
• Ram Memory Size: 4KB
• Cpu Speed: 16MHz
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9.10
9.10.1
8151H–AVR–02/11
Register Description
MCUCR - MCU Control Register
The MCU Control Register contains control bits for power management.
• Bit 5 – SE: Sleep Enable
The SE bit must be written to logic one to make the MCU enter the Sleep mode when the
SLEEP instruction is executed. To avoid the MCU entering the Sleep mode unless it is the pro-
grammers purpose, it is recommended to write the Sleep Enable (SE) bit to one just before the
execution of the SLEEP instruction and to clear it immediately after waking up.
• Bits 4:2 – SM2:0: Sleep Mode Select Bits 2, 1, and 0
These bits select betw’een the six available sleep modes as shown in
Table 9-2.
Note:
Bit
Read/Write
Initial Value
SM2
0
0
0
0
1
1
1
1
1. Standby mode and Extended Standby mode are only available with external crystals or
resonators.
Sleep Mode Select
SRE
R/W
7
0
SM1
0
0
1
1
0
0
1
1
SRW10
R/W
6
0
R/W
SE
5
0
SM0
0
1
0
1
0
1
0
1
SM1
R/W
4
0
Sleep Mode
Idle
ADC Noise Reduction
Power-down
Power-save
Reserved
Reserved
Standby
Extended Standby
SM0
R/W
3
0
(1)
SM2
R/W
2
0
(1)
IVSEL
Table
ATmega128A
R/W
1
0
9-2.
IVCE
R/W
0
0
MCUCR
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