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void wr_low()
{
	PRT1DR &= ~0x03;
}
void wr_high()
{
	PRT1DR |= 0x03;
}
void a0_adr()
{
	PRT1DR &= ~0x04;
}
void a0_dat()
{
	PRT1DR |= 0x04;
}
void ic_rst()
{
	PRT1DR &= ~0x08;
}
void ic_set()
{
	PRT1DR |= 0x08;
}

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{
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	PRT2DR = adr;
	
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	a0_adr();
	wr_low();
	
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	wr_high();
		
	// [4]data input
	PRT2DR = dat;
	
	// [5]data write enabled(/WR=0, /CS=0, A0=1)
	a0_dat();
	wr_low();
	
	// [6]data write disabled(/WR=1, /CS=1, A0=1)
	wr_high();
}

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