ATtiny43U datasheet(142/182 Pages) ATMEL

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8048B–AVR–03/09

ATtiny43U

19.3.1

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, also when the device is

locked.

Signature bytes can also be read by the device firmware. See section “Reading the Fuse and

Lock Bits from Software” on page 135.

The three signature bytes reside in a separate address space called the device signature imprint

table. The signature data for ATtiny43U is given in Table 19-7.

19.3.2

Calibration Byte

The device signature imprint table of ATtiny43U contains one byte of calibration data for the

internal oscillator, as shown in Table 19-6 on page 141. During reset, this byte is automatically

written into the OSCCAL register to ensure correct frequency of the calibrated oscillator.

Calibration bytes can also be read by the device firmware. See section “Reading the Fuse and

Lock Bits from Software” on page 135.

19.4

Page Size

19.5

Parallel Programming Parameters, Pin Mapping, and Commands

This section describes how to parallel program and verify Flash Program memory, EEPROM

Data memory, Memory Lock bits, and Fuse bits in the ATtiny43U. Pulses are assumed to be at

least 250 ns unless otherwise noted.

19.5.1

Signal Names

In this section, some pins of the ATtiny43U are referenced by signal names describing their

functionality during parallel programming, see Figure 19-1 and Table 19-10. Pins not described

in the following table are referenced by pin names.

Table 19-7.

Device Signature Byte

Part

Signature Byte 0

Signature Byte 1

Signature Byte 0

ATtiny43U

0x1E

0x92

0x0C

Table 19-8.

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

Device

Flash Size

Page Size

PCWORD

No. of Pages

PCPAGE

PCMSB

ATtiny43U

2K words

(4K bytes)

32 words

PC[4:0]

PC[10:5]

Table 19-9.

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

Device

EEPROM Size

Page Size

PCWORD

No. of Pages

PCPAGE

EEAMSB

ATtiny43U

64 bytes

4 bytes

EEA[1:0]

EEA[5:2]

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