ATMEGA8515L-8PC Atmel, ATMEGA8515L-8PC Datasheet - Page 41
![IC AVR MCU 8K LV 8MHZ COM 40-DIP](/photos/6/70/67049/453-40-dip_sml.jpg)
ATMEGA8515L-8PC
Manufacturer Part Number
ATMEGA8515L-8PC
Description
IC AVR MCU 8K LV 8MHZ COM 40-DIP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8515L-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
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 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
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Power Management
and Sleep Modes
MCU Control Register –
MCUCR
MCU Control and Status
Register – MCUCSR
2512K–AVR–01/10
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 three 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, or 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, it exe-
cutes the interrupt routine, and resumes execution from the instruction following SLEEP.
The contents of the Register File and SRAM are unaltered 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 34 presents the different clock systems in the ATmega8515, 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 programmers 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 three available sleep modes as shown
in Table 16.
• Bit 5 – SM2: Sleep Mode Select Bit 2
The Sleep Mode Select bits select between the three available sleep modes as shown
in Table 16.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
SRE
R/W
R/W
7
0
7
–
0
SRW10
R/W
R/W
6
0
6
–
0
SM2
R/W
R/W
SE
5
0
5
0
SM1
R/W
R/W
4
0
4
–
0
WDRF
ISC11
R/W
R/W
3
0
3
0
BORF
ISC10
R/W
R/W
2
0
2
0
ATmega8515(L)
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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