Rainbow-electronics ATmega8515L Manual do Utilizador descarregar pdf (Página 178)

178

ATmega8515(L)

2512A–AVR–04/02

Parallel Programming

Parameters, Pin

Mapping, and

Commands

Thissection describeshow to parallelprogram and verify Flash Program memory,

EEPROM Data memory, Memory Lock bits, andFuse bits in the ATmega8515. Pulses

areassumed to beatleast 250 ns unless otherwise noted.

Signal Names Inthissection,some pins of the ATmega8515 are referencedbysignal namesdescrib-

ing theirfunctionalityduring parallelprogramming,see Figure 74and Table85.Pins not

described in the following tableare referencedbypin names.

The XA1/XA0 pinsdetermine theaction executedwhen the XTAL1 pin is given a posi-

tive pulse. The bit coding isshowninTable87.

When pulsing WR

orOE, the commandloadeddetermines theaction executed.The dif-

ferent Commands are showninTable88.

Figure 74. Parallel Programming

Table 85. Pin Name Mapping

Signal Name in Programming Mode Pin Name I/O Function

RDY/BSY

PD1 O

0:Deviceisbusy programming, 1:

Deviceisready for newcommand

PD2 IOutput Enable (Active low)

PD3 I Write Pulse (Active low)

BS1PD4 I

Byte Select1(“0” selectslow

byte, “1” selectshighbyte)

XA0 PD5 IXTA L Action Bit 0

XA1 PD6 I XTA L Action Bit 1

PAGEL PD7 I

Program Memory andEEPROM

data Page Load

BS2PA0I

Byte Select2(“0” selectslow

byte, “1” selects 2’ndhighbyte)

DATA P B7-0 I/O

Bi-directionalData bus(Output

when OE

islow)

VCC

+5V

GND

XTAL1

PD1

PD2

PD3

PD4

PD5

PD6

PB7 - PB0 DATA

RESET

PD7

+12 V

BS1

XA0

XA1

RDY/BSY

PAGEL

PA0

BS2

1 2 ... 173 174 175 176 177 178 179 180 181 182 183 ... 222 223

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