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ATtiny44 Datasheet(PDF) 162 Page - ATMEL Corporation

No. de pieza ATtiny44
Descripción Electrónicos  8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
PDF  236 Pages
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATtiny44 Datasheet(HTML) 162 Page - ATMEL Corporation

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8006H–AVR–10/09
ATtiny24/44/84
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 Lock, Fuse and
Signature Data from Software” on page 155.
The three signature bytes reside in a separate address space called the device signature imprint
table. The signature data for ATtiny24/44/84 is given in Table 19-7.
19.3.2
Calibration Byte
The device signature imprint table of ATtiny24/44/84 contains one byte of calibration data for the
internal oscillator, as shown in Table 19-6 on page 161. 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 Lock, Fuse and
Signature Data from Software” on page 155.
19.4
Page Size
Table 19-7.
Device Signature Bytes
Part
Signature Byte 0
Signature Byte 1
Signature Byte 0
ATtiny24
0x1E
0x91
0x0B
ATtiny44
0x1E
0x92
0x07
ATtiny84
0x1E
0x93
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
ATtiny24
1K words
(2K bytes)
16 words
PC[3:0]
64
PC[9:4]
9
ATtiny44
2K words
(4K bytes)
32 words
PC[4:0]
64
PC[10:5]
10
ATtiny84
4K words
(8K bytes)
32 words
PC[4:0]
128
PC[11:5]
11
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
ATtiny24
128 bytes
4 bytes
EEA[1:0]
32
EEA[6:2]
6
ATtiny44
256 bytes
4 bytes
EEA[1:0]
64
EEA[7:2]
7
ATtiny84
512 bytes
4 bytes
EEA[1:0]
128
EEA[8:2]
8



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