ATtiny167 datasheet(238/282 Pages) ATMEL

238 / 282 page

238

7728D–AVR–07/09

ATtiny87/ATtiny167

21.7.15

Reading the Temperature Sensor Parameter Bytes

The algorithm for reading the Temperature Sensor parameter bytes is as follows (refer to “Pro-

gramming the Flash” on page 232 for details on Command and Address loading):

A: Load Command “0000 1000

b”.

B: Load Address Low Byte, 0x0003 or 0x0005.

Set OE to “0”, and BS1 to “1”. The Temperature Sensor parameter byte can now be

read at DATA.

Set OE to “1”.

21.8

Serial Downloading

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 (output). After RESET is set low, the Programming Enable instruction needs to be exe-

cuted first before program/erase operations can be executed.

Note:

In Table 21-13, the pin mapping for SPI programming is listed. Not all parts use the SPI pins

dedicated for the internal SPI interface.

Figure 21-7. Serial Programming and Verify

(Note:)

Note:

If the device is clocked by the internal Oscillator, it is no need to connect a clock source to the

XTAL1 pin

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

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

instruction. The Chip Erase operation turns the content of every memory location in both the

Program and EEPROM arrays into 0xFF.

Table 21-13. Pin Mapping Serial Programming

Symbol

Pin Name

I/O

Function

MOSI

PA4

Serial Data In

MISO

PA2

Serial Data Out

SCK

PA5

Serial Clock

Vcc

+2.7 - +5.5V

GND

PA4

PA2

PA5

MOSI

MISO

SCK

RESET / PB7

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