ATMEGA8A-MUR Atmel, ATMEGA8A-MUR Datasheet - Page 36

• Manufacturer Part Number: ATMEGA8A-MUR
• Description: MCU AVR 8KB FLASH 16MHZ 32QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA8A-MUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 23
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K 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: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9.8
9.8.1
8159D–AVR–02/11
Register Description
MCUCR – MCU Control Register
The MCU Control Register contains control bits for power management.
• Bit 7 – 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 programmer’s
purpose, it is recommended to set the Sleep Enable (SE) bit just before the execution of the
SLEEP instruction.
• Bits 6:4 – SM2:0: Sleep Mode Select Bits 2, 1, and 0
These bits select between the five available sleep modes as shown in
Table 9-2.
Note:
Bit
Read/Write
Initial Value
SM2
0
0
0
0
1
1
1
1. Standby mode is only available with external crystals or resonators.
Sleep Mode Select
R/W
SE
7
0
SM1
0
0
1
1
0
0
1
SM2
R/W
6
0
SM1
R/W
5
0
SM0
0
1
0
1
0
1
0
SM0
R/W
4
0
Sleep Mode
Idle
ADC Noise Reduction
Power-down
Power-save
Reserved
Reserved
Standby
ISC11
R/W
3
0
(1)
ISC10
R/W
2
0
ISC01
R/W
Table
1
0
ATmega8A
9-2.
ISC00
R/W
0
0
MCUCR
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