ATtiny43U datasheet(136/182 Pages) ATMEL

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136

8048B–AVR–03/09

ATtiny43U

To read the Fuse High Byte (FHB), simply replace the address in the Z-pointer with 0x0003 and

repeat the procedure above. If successful, the contents of the destination register are as follows.

Refer to Table 19-4 on page 140 for detailed description and mapping of the Fuse High Byte.

To read the Fuse Extended Byte (FEB), replace the address in the Z-pointer with 0x0002 and

repeat the previous procedure. If successful, the contents of the destination register are as

follows.

Refer to Table 19-3 on page 140 for detailed description and mapping of the Fuse Extended

Byte.

18.6.3

Reading Device Signature Imprint Table from Firmware

To read the contents of the device signature imprint table, follow the below procedure:

Load the Z-pointer with the table index.

Set RSIG and SPMEN bits in SPMCSR.

Issue an LPM instruction within three clock cycles.

Read table data from the LPM destination register.

See program example below.

Note:

See “Code Examples” on page 6.

If successful, the contents of the destination register are as described in section “Device Signa-

ture Imprint Table” on page 141.

Bit

543

FHB7

FHB6

FHB5

FHB4

FHB3

FHB2

FHB1

FHB0

Bit

543

FEB7

FEB6

FEB5

FEB4

FEB3

FEB2

FEB1

FEB0

Assembly Code Example

DSIT_read:

; Uses Z-pointer as table index

ldi

ZH, 0

ldi

ZL, 1

; Preload SPMCSR bits into R16, then write to SPMCSR

ldi

r16, (1<<RSIG)|(1<<SPMEN)

out

SPMCSR, r16

; Issue LPM. Table data will be returned into r17

lpm

r17, Z

ret

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