ATMEGA163 datasheet(59/187 Pages) ATMEL

Part #	ATMEGA163

Description	8-bit Microcontroller with 16K Bytes In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

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ATmega163(L)

1142E–AVR–02/03

on the following cycle of the timer clock, that is, the timer is always advanced by at

least one before the processor can read the counter value. After wake-up, the MCU

is halted for four clock cycles, it executes the interrupt routine, and resumes

execution from the instruction following SLEEP.

•

During asynchronous operation, the synchronization of the interrupt flags for the

asynchronous timer takes three processor cycles plus one timer cycle. The timer is

therefore advanced by at least one before the processor can read the timer value

causing the setting of the Interrupt Flag. The output compare pin is changed on the

timer clock and is not synchronized to the processor clock.

•

After waking up from Power-save mode with the asynchronous timer enabled, there

will be a short interval in which TCNT2 will read as the same value as before Power-

save mode was entered. After an edge on the asynchronous clock, TCNT2 will read

correctly (The compare and overflow functions of the Timer are not affected by this

behavior.). Safe procedure to ensure that the correct value is read:

1.

Write any value to either of the registers OCR2 or TCCR2.

2.

Wait for the corresponding Update Busy Flag to be cleared.

3.

Read TCNT2.

Note that OCR2 and TCCR2 are never modified by hardware, and will always read

correctly.

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