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110

8127B–AVR–08/09

ATtiny4/5/9/10

Configuration bits are not affected by a chip erase but they can be cleared using the configura-

tion section erase command (see “Erasing the Configuration Section” on page 113). Note that

configuration bits are locked if Non-Volatile Lock Bit 1 (NVLB1) is programmed.

15.3.3.1 Latching of Configuration Bits

All configuration bits are latched either when the device is reset or when the device exits the

external programming mode. Changes to configuration bit values have no effect until the device

leaves the external programming mode.

15.3.4 Signature Section

The signature section is a dedicated memory area used for storing miscellaneous device infor-

mation, such as the device signature. Most of this memory section is reserved for internal use,

as shown in Table 15-7.

ATtiny4/5/9/10 have a three-byte signature code, which can be used to identify the device. The

three bytes reside in the signature section, as shown in Table 15-7. The signature data for

ATtiny4/5/9/10 is given in Table 15-8.

15.3.5 Calibration Section

ATtiny4/5/9/10 have one calibration byte. The calibration byte contains the calibration data for

the internal oscillator and resides in the calibration section, as shown in Table 15-9. During

reset, the calibration byte is automatically written into the OSCCAL register to ensure correct fre-

quency of the calibrated internal oscillator.

Table 15-7. Signature bytes

Signature word address

Signature word data

High byte Low byte

0x00 Device ID 1 Manufacturer ID

0x01 Reserved for internal use Device ID 2

0x02 ... 0x0F Reserved for internal use Reserved for internal use

Table 15-8. Signature codes

Part

Signature Bytes

Manufacturer ID Device ID 1 Device ID 2

ATtiny4

0x1E 0x8F 0x0A

ATtiny5

0x1E 0x8F 0x09

ATtiny9

0x1E 0x90 0x08

ATtiny10

0x1E 0x90 0x03

Table 15-9. Calibration byte

Calibration word address

Calibration word data

High byte Low byte

0x00 Reserved Internal oscillator calibration value

0x01 ... 0x07 Reserved Reserved

1 2 ... 105 106 107 108 109 110 111 112 113 114 115 ... 165 166

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