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AT90S8515-4PC Datasheet(PDF) 31 Page - ATMEL Corporation

Part # AT90S8515-4PC
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90S8515-4PC Datasheet(HTML) 31 Page - ATMEL Corporation

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AT90S8515
0841G–09/01
Sleep Modes
To enter the sleep modes, the SE bit in MCUCR must be set (one) and a SLEEP instruc-
tion must be executed. If an enabled interrupt occurs while the MCU is in a sleep mode,
the MCU awakes, executes the interrupt routine and resumes execution from the
instruction following SLEEP. The contents of the register file, SRAM and I/O memory
are unaltered. If a reset occurs during Sleep Mode, the MCU wakes up and executes
from the Reset vector.
Idle Mode
When the SM bit is cleared (zero), the SLEEP instruction forces the MCU into the Idle
Mode, stopping the CPU but allowing Timer/Counters, Watchdog and the interrupt sys-
tem to continue operating. This enables the MCU to wake up from external triggered
interrupts as well as internal ones like Timer Overflow interrupt and Watchdog reset. If
wake-up from the Analog Comparator interrupt is not required, the Analog Comparator
can be powered down by setting the ACD-bit in the Analog Comparator Control and Sta-
tus Register (ACSR). This will reduce power consumption in Idle Mode. When the MCU
wakes up from Idle Mode, the CPU starts program execution immediately.
Power-down Mode
When the SM bit is set (one), the SLEEP instruction forces the MCU into the Power-
down mode. In this mode, the external oscillator is stopped, while the external interrupts
and the Watchdog (if enabled) continue operating. Only an external reset, a Watchdog
reset (if enabled), or an external level interrupt on INT0 or INT1 can wake up the MCU.
Note that when a level-triggered interrupt is used for wake-up from power-down, the low
level must be held for a time longer than the reset delay Time-out period tTOUT. Other-
wise, the MCU will fail to wake up.


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