Rainbow-electronics ATtiny43U Bedienungsanleitung PDF herunterladen (Seite 151)

151

8048B–AVR–03/09

1. A: Load Command “0000 1000”.

2. B: Load Address Low Byte, 0x00.

3. Set OE

to “0”, and BS1 to “1”. The Calibration byte can now be read at DATA.

4. Set OE

to “1”.

19.7 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 19-7 below.

Figure 19-7. 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

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

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

Program and EEPROM arrays into 0xFF.

Depending on CKSEL Fuses, a valid clock must be present. The minimum low and high periods

for the serial clock (SCK) input are defined as follows:

Low:> 2 CPU clock cycles for f

< 12 MHz, 3 CPU clock cycles for f

>= 12 MHz

High:> 2 CPU clock cycles for f

< 12 MHz, 3 CPU clock cycles for f

>= 12 MHz

Table 19-14. Pin Mapping Serial Programming

Symbol Pins I/O Description

MOSI PB4 I Serial Data in

MISO PB5 O Serial Data out

SCK PB6 I Serial Clock

VCC

GND

SCK

MISO

MOSI

RESET/PA7

+1.8 - 5.5V

PB4

PB5

PB6

1 2 ... 146 147 148 149 150 151 152 153 154 155 156 ... 181 182

Kommentare zu diesen Handbüchern

Keine Kommentare

Rainbow-electronics ATtiny43U Bedienungsanleitung Seite 151

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Sensoren Rainbow-electronics ATtiny43U