Rainbow-electronics ATmega8515L Instrukcja Użytkownika Pobierz pdf (Strona 189)

189

ATmega8515(L)

2512A–AVR–04/02

Serial Downloading Both the Flash andEEPROM memory arrays can be programmed using the serialSPI

buswhileRESET

ispulled to GND.The serial interface consists ofpinsSCK,MOSI

(input) andMISO(output).After RESET

isset low, theProgramming Enableinstruction

needs to beexecutedfirst before program/eraseoperationscan beexecuted.

Note:InTable 92, the pin mapping forSPIprogramming islisted. Not all parts usethe SPIpins

dedicatedfor theinternalSPI interface.

Serial Programming Pin

Mapping

Both the Flash andEEPROM memory arrays can be programmed using the serialSPI

buswhileRESET

ispulled to GND.The serial interface consists ofpinsSCK,MOSI

(input) andMISO(output).After RESET

isset low, theProgramming Enableinstruction

needs to beexecutedfirst before program/eraseoperationscan beexecuted. NOTE, in

Table 92onpage 189, the pin mapping forSPIprogramming islisted. Not all parts use

the SPIpinsdedicatedfor theinternalSPI interface.

Figure 83. Serial Programming and Verify

(1)

Note: 1. If the deviceisclockedbytheinternal oscillator, it is no need to connectaclock

sourcetothe XTA L1 pin.

When programming the EEPROM, an auto-erase cycleisbuiltintothe self-timedpro-

gramming operation (in the Serial mode ONLY) and thereis no need to firstexecute the

ChipEraseinstruction. The ChipEraseoperation turns the content of every memory

location in both theProgram andEEPROM arrays into $FF.

Depending on CKSEL Fuses, avalidclock must be present. Theminimumlow andhigh

periods for the serialclock (SCK) input are defined asfollows:

Low: > 2 CPUclock cyclesforf

< 12 MHz, 3 CPUclock cyclesforf

≥ 12 MHz

High: > 2 CPUclock cyclesforf

< 12 MHz, 3 CPUclock cyclesforf

≥ 12 MHz

Table 92. Pin Mapping Serial Programming

Symbol Pins I/O

Description

MOSI PB5 ISerialdata in

MISO PB6 O Serialdata out

SCK PB7 I Serialclock

VCC

GND

XTAL1

SCK

MISO

MOSI

RESET

1 2 ... 184 185 186 187 188 189 190 191 192 193 194 ... 222 223

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