ATmega16-16PU datasheet(23/357 Pages) ATMEL

Teilenummer	ATmega16-16PU

Bauteilbeschribung	8-bit Microcontroller with 16K Bytes In-Syustem Programmable Flash

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Hersteller	ATMEL [ATMEL Corporation]

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2466S–AVR–05/09

ATmega16(L)

EEPROM data corruption can easily be avoided by following this design recommendation:

Keep the AVR RESET active (low) during periods of insufficient power supply voltage. This

can be done by enabling the internal Brown-out Detector (BOD). If the detection level of the

internal BOD does not match the needed detection level, an external low V

CC Reset Protec-

tion circuit can be used. If a reset occurs while a write operation is in progress, the write

operation will be completed provided that the power supply voltage is sufficient.

I/O Memory

The I/O space definition of the ATmega16 is shown in “Register Summary” on page 331.

All ATmega16 I/Os and peripherals are placed in the I/O space. The I/O locations are accessed

by the IN and OUT instructions, transferring data between the 32 general purpose working regis-

ters and the I/O space. I/O Registers within the address range $00 - $1F are directly bit-

accessible using the SBI and CBI instructions. In these registers, the value of single bits can be

checked by using the SBIS and SBIC instructions. Refer to the Instruction Set section for more

details. When using the I/O specific commands IN and OUT, the I/O addresses $00 - $3F must

be used. When addressing I/O Registers as data space using LD and ST instructions, $20 must

be added to these addresses.

For compatibility with future devices, reserved bits should be written to zero if accessed.

Reserved I/O memory addresses should never be written.

Some of the Status Flags are cleared by writing a logical one to them. Note that the CBI and SBI

instructions will operate on all bits in the I/O Register, writing a one back into any flag read as

set, thus clearing the flag. The CBI and SBI instructions work with registers $00 to $1F only.

The I/O and Peripherals Control Registers are explained in later sections.

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