ATMEGA162L-8PC Atmel, ATMEGA162L-8PC Datasheet - Page 41

• Manufacturer Part Number: ATMEGA162L-8PC
• Description: IC MCU AVR 16K 3V 8MHZ 40-DIP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA162L-8PC

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: EBI/EMI, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 35
• Program Memory Size: 16KB (8K 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
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -

Power Management
and Sleep Modes
MCU Control Register –
MCUCR
MCU Control and Status
Register – MCUCSR
2513C–AVR–09/02
Sleep modes enable the application to shut down unused modules in the MCU, thereby
saving power. The AVR provides various sleep modes allowing the user to tailor the
power consumption to the application’s requirements.
To enter any of the five sleep modes, the SE bit in MCUCR must be written to logic one
and a SLEEP instruction must be executed. The SM2 bit in MCUCSR, the SM1 bit in
MCUCR, and the SM0 bit in the EMCUCR Register select which sleep mode (Idle,
Power-down, Power-save, Standby, or Extended Standby) will be activated by the
SLEEP instruction. See Table 16 for a summary. If an enabled interrupt occurs while the
MCU is in a sleep mode, the MCU wakes up. The MCU is then halted for four cycles in
addition to the start-up time, executes the interrupt routine, and resumes execution from
the instruction following SLEEP. The contents of the Register File and SRAM are unal-
tered when the device wakes up from sleep. If a Reset occurs during sleep mode, the
MCU wakes up and executes from the Reset Vector.
Figure 18 on page 33 presents the different clock systems in the ATmega162, and their
distribution. The figure is helpful in selecting an appropriate sleep mode.
• 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 programmer’s 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 wak-
ing up.
• Bit 4 – SM1: Sleep Mode Select Bit 1
The Sleep Mode Select bits select between the five available sleep modes as shown in
Table 16.
• Bit 5 – SM2: Sleep Mode Select Bit 2
The Sleep Mode Select bits select between the five available sleep modes as shown in
Table 16.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
SRE
R/W
R/W
JTD
7
0
7
0
SRW10
R/W
R/W
6
0
6
–
0
R/W
SM2
R/W
SE
5
0
5
0
JTRF
SM1
R/W
R/W
4
0
4
0
WDRF
ISC11
R/W
R/W
3
0
3
0
ATmega162(V/U/L)
ISC10
BORF
R/W
R/W
2
0
2
0
EXTRF
ISC01
R/W
R/W
1
0
1
0
ISC00
PORF
R/W
R/W
0
0
0
0
MCUCSR
MCUCR
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