ATtiny44 datasheet(163/236 Pages) ATMEL

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

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163 / 236 page

163

8006H–AVR–10/09

ATtiny24/44/84

19.5

Serial Programming

Both the Flash and EEPROM memory arrays can be programmed using the serial SPI bus while

RESET is pulled to GND. The serial interface consists of pins SCK, MOSI (input) and MISO (out-

put). See Figure 19-1 below.

Figure 19-1. Serial Programming and Verify

Note:

If clocked by internal oscillator there is no need to connect a clock source to the CLKI pin.

After RESET is set low, the Programming Enable instruction needs to be executed first before

program/erase operations can be executed.

Note:

In Table 19-10 above, the pin mapping for SPI programming is listed. Not all devices use the SPI

pins dedicated for the internal SPI interface.

When programming the EEPROM, an auto-erase cycle is built into the self-timed programming

operation (in the Serial mode ONLY) and there is no need to first execute the Chip Erase

Table 19-10. Pin Mapping Serial Programming

Symbol

Pins

I/O

Description

MOSI

PA6

Serial Data in

MISO

PA5

Serial Data out

SCK

PA4

Serial Clock

VCC

GND

SCK

MISO

MOSI

RESET

+1.8 - 5.5V

ATtiny44 Datasheet(PDF) 163 Page - ATMEL Corporation