?? 62256.c
字號:
#define CS_ram PORTB.2
#define CS_ram_en DDRB.2
void writeram(unsigned int address,unsigned char data)
{unsigned char temp=0;
CS_ram_en=1;
CS_ram=1;
temp=address;
send_a(temp);
address=address>>8;
temp=address;
send_b(temp);
BUS_en=0xff;
BUS_out=data;
CS_ram=0;//片選上62256
#asm("NOP")
WR=0;
WR=1;
#asm("NOP")
temp=BUS_in;
CS_ram=1;
}
unsigned char readram(unsigned int address)
{unsigned char temp=0;
CS_ram_en=1;
CS_ram=1;
RD_en=1;
temp=address;
send_a(temp);
address=address>>8;
temp=address;
send_b(temp);
BUS_en=0x00;
BUS_out=0x00;
CS_ram=0;//片選上62256
RD=0;
#asm
NOP
NOP
#endasm
temp=BUS_in;
RD=1;
CS_ram=1;
return temp;
}
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