Rainbow Electronics ATtiny10 - Manual (Page 110)

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