ATtiny44 datasheet(167/236 Pages) ATMEL

167 / 236 page

167

8006H–AVR–10/09

ATtiny24/44/84

If the LSB in RDY/BSY data byte out is ‘1’, a programming operation is still pending. Wait until

this bit returns ‘0’ before the next instruction is carried out.

Within the same page, the low data byte must be loaded prior to the high data byte.

After data is loaded to the page buffer, program the EEPROM page, see Figure 19-2 on page

166.

19.6

High-voltage Serial Programming

This section describes how to program and verify Flash Program memory, EEPROM Data mem-

ory, Lock bits and Fuse bits in the ATtiny24/44/84.

Figure 19-3. High-voltage Serial Programming

The minimum period for the Serial Clock Input (SCI) during High-voltage Serial Programming is

220 ns.

Table 19-13. Pin Name Mapping

Signal Name in High-voltage

Serial Programming Mode

Pin Name

I/O

Function

SDI

PA6

Serial Data Input

SII

PA5

Serial Instruction Input

SDO

PA4

Serial Data Output

SCI

PB0

Serial Clock Input (min. 220ns period)

Table 19-14. Pin Values Used to Enter Programming Mode

Symbol

Value

PA0

Prog_enable[0]

PA1

Prog_enable[1]

PA2

Prog_enable[2]

VCC

GND

SDO

SII

SDI

(RESET)

+4.5 - 5.5V

PA6

PA5

PA4

PB3

+11.5 - 12.5V

PB0

SCI

PA2:0

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