ATtiny261-ESMZ datasheet(174/227 Pages) ATMEL

174 / 227 page

174

7753C–AVR–07/09

ATtiny261/ATtiny461/ATtiny861

22.5

Reading the Signature Row from Software

To read the Signature Row from software, load the Z-pointer with the signature byte address

given in Table 22-6 on page 173 and set the SIGRD and SPMEN bits in SPMCSR. When an

LPM instruction is executed within three CPU cycles after the SIGRD and SPMEN bits are set in

SPMCSR, the signature byte value will be loaded in the destination register. The SIGRD and

SPMEN bits will auto-clear upon completion of reading the Signature Row Lock bits or if no LPM

instruction is executed within three CPU cycles. When SIGRD and SPMEN are cleared, LPM will

work as described in the Instruction set Manual.

Note:

Before attempting to set SPMEN it is important to test this bit is cleared showing that the hardware

is ready for a new operation.

22.6

Page Size

22.7

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 ATtiny261/461/861. Pulses are assumed

to be at least 250 ns unless otherwise noted.

22.7.1

Signal Names

In this section, some pins of the ATtiny261/461/861 are referenced by signal names describing

their functionality during parallel programming, see Figure 22-1 and Table 22-9. Pins not

described in the following table are referenced by pin names.

The XA1/XA0 pins determine the action executed when the XTAL1 pin is given a positive pulse.

The bit coding is shown in Table 22-11.

When pulsing WR or OE, the command loaded determines the action executed. The different

Commands are shown in Table 22-12.

Table 22-7.

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

Device

Flash Size

Page Size

PCWORD

No. of Pages

PCPAGE

PCMSB

ATtiny261

1K words (2K bytes)

16 words

PC[3:0]

PC[9:4]

ATtiny461

2K words (4K bytes)

32 words

PC[4:0]

PC[10:5]

ATtiny861

4K words (8K bytes)

32 words

PC[4:0]

128

PC[11:5]

Table 22-8.

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

Device

EEPROM

Size

Page Size

PCWORD

No. of Pages

PCPAGE

EEAMSB

ATtiny261

128 bytes

2 bytes

EEA[1:0]

EEA[6:2]

ATtiny461

256 bytes

4 bytes

EEA[1:0]

EEA[7:2]

ATtiny861

512 bytes

4 bytes

EEA[1:0]

128

EEA[8:2]

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