[code]
void External_RAM_Init()
{
XMCRB = 0;
XMCRA = 0;

PORTA = 0x00;
DDRA = 0xFF;

XMCRB |= (1 << XMM1) | (1 << XMM2) | (1 << XMM0) | (1 << XMBK); //Disable PC pins.
XMCRA |= (1 << SRE) | (1 << SRW11) | (1 << SRW10); // Adjustment of external memory: one sector, the minimal speed.
}

[/code]