ATtiny167-ESSZ datasheet(221/282 Pages) ATMEL

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221

7728D–AVR–07/09

ATtiny87/ATtiny167

Similarly, when reading the Extended Fuse byte (EFB), load 0x0002 in the Z-pointer. When an

LPM instruction is executed within three cycles after the RFLB and SPMEN bits are set in the

SPMCSR, the value of the Extended Fuse byte will be loaded in the destination register as

shown below. See Table 21-3 on page 226 for detailed description and mapping of the

Extended Fuse byte.

Fuse and Lock bits that are programmed, will be read as zero. Fuse and Lock bits that are

unprogrammed, will be read as one.

20.2.4

Reading the Signature Row from Software

To read the Signature Row from software, load the Z-pointer with the signature byte address

given in Table 20-1 on page 221 and set the SIGRD and SPMEN bits in SPMCSR. When an

LPM instruction is executed within three CPU cycles after the SIGRD and SPMEN bits are set

in SPMCSR, the signature byte value will be loaded in the destination register. The SIGRD

and SPMEN bits will auto-clear upon completion of reading the Signature Row Lock bits or if

no LPM instruction is executed within three CPU cycles. When SIGRD and SPMEN are

cleared, LPM will work as described in the Instruction set Manual.

Note:

All other addresses are reserved for future use.

Bit

765

3210

Rd (Z=0x0002)

–––

–

–––

EFB0

Table 20-1.

Signature Row Addressing

Signature Byte

Z-Pointer Address

Device Signature Byte 0

0x0000

Device Signature Byte 1

0x0002

Device Signature Byte 2

0x0004

8MHz RC Oscillator Calibration Byte

0x0001

TSOFFSET - Temp Sensor Offset

0x0005

TSGAIN - Temp Sensor Gain

0x0007

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