ATtiny13A-SSH datasheet(105/174 Pages) ATMEL

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105

8126D–AVR–11/09

ATtiny13A

Note that fuse bits are locked if Lock Bit 1 (LB1) is programmed. Program the fuse bits before

programming the lock bits. The status of the fuse bits is not affected by Chip Erase.

Fuse bits can also be read by the device firmware. See section “Reading Fuse and Lock Bits

from Firmware” on page 100.

17.2.1

Latching of Fuses

The fuse values are latched when the device enters programming mode and changes of the

fuse values will have no effect until the part leaves Programming mode. This does not apply to

the EESAVE fuse which will take effect once it is programmed. The fuses are also latched on

Power-up in Normal mode.

17.3 Calibration Bytes

The signature area of the ATtiny13A contains two bytes of calibration data for the internal oscil-

lator. The calibration data in the high byte of address 0x00 is for use with the oscillator set to 9.6

MHz operation. During reset, this byte is automatically written into the OSCCAL register to

ensure correct frequency of the oscillator.

There is a separate calibration byte for the internal oscillator in 4.8 MHz mode of operation but

this data is not loaded automatically. The hardware always loads the 9.6 MHz calibration data

during reset. To use separate calibration data for the oscillator in 4.8 MHz mode the OSCCAL

the high byte at address 0x01 of the signature area.

17.4 Signature Bytes

All Atmel microcontrollers have a three-byte signature code which identifies the device. This

code can be read in both serial and high-voltage programming mode, even when the device is

locked. The three bytes reside in a separate address space.

For the ATtiny13A the signature bytes are:

• 0x000: 0x1E (indicates manufactured by Atmel).

• 0x001: 0x90 (indicates 1 KB Flash memory).

• 0x002: 0x07 (indicates ATtiny13A device when 0x001 is 0x90).

17.5 Page Size

Table 17-5.

No. of Words in a Page and No. of Pages in the Flash

Flash Size

Page Size

PCWORD

No. of Pages

PCPAGE

PCMSB

512 words (1K byte)

16 words

PC[3:0]

PC[8:4]

Table 17-6.

No. of Words in a Page and No. of Pages in the EEPROM

EEPROM Size

Page Size

PCWORD

No. of Pages

PCPAGE

EEAMSB

64 bytes

4 bytes

EEA[1:0]

EEA[5:2]

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