ATtiny167-ESSZ datasheet(15/282 Pages) ATMEL

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7728D–AVR–07/09

ATtiny87/ATtiny167

AVR Memories

This section describes the different memories in the ATtiny87/167. The AVR architecture has

two main memory spaces, the Data memory and the Program memory space. In addition, the

ATtiny87/167 features an EEPROM Memory for data storage. All three memory spaces are

linear and regular.

Notes:

1. Byte address.

2. Word (16-bit) address.

3.1

In-System Re-programmable Flash Program Memory

The ATtiny87/167 contains On-chip In-System Reprogrammable Flash memory for program

storage (see “Flash size” in Table 3-1 on page 15). Since all AVR instructions are 16 or 32 bits

wide, the Flash is organized as 16 bits wide. ATtiny87/167 does not have separate Boot

Loader and Application Program sections, and the SPM instruction can be executed from the

entire Flash. See SELFPRGEN description in Section 20.2.1 “Store Program Memory Control

and Status Register – SPMCSR” on page 219 for more details.

The Flash memory has an endurance of at least 10,000 write/erase cycles in automotive

range. The ATtiny87/167 Program Counter (PC) address the program memory locations. Sec-

tion 21. “Memory Programming” on page 225 contains a detailed description on Flash data

serial downloading using the SPI pins.

Constant tables can be allocated within the entire Program memory address space (see the

LPM – Load Program memory instruction description).

Table 3-1.

Memory Mapping.

Memory

Mnemonic

ATtiny87

ATtiny167

Flash

Size

Flash size

8 K bytes

16 K bytes

Start Address

0x0000

End Address

Flash end

0x1FFF(1)

0x0FFF(2)

0x3FFF(1)

0x1FFF(2)

32 Registers

Size

32 bytes

Start Address

0x0000

End Address

0x001F

I/O

Registers

Size

64 bytes

Start Address

0x0020

End Address

0x005F

Ext I/O

Registers

Size

160 bytes

Start Address

0x0060

End Address

0x00FF

Internal

SRAM

Size

ISRAM size

512 bytes

Start Address

ISRAM start

0x0100

End Address

ISRAM end

0x02FF

EEPROM

Size

E2 size

512 bytes

Start Address

0x0000

End Address

E2 end

0x01FF

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