STC micro STC8A8K64D4 Series - Page 635

STC8A8K64D4 Series Manual
- 619 -
if (I2CSLST & 0x40)
{
I2CSLST &= ~0x40; //Handle the START event
}
else if (I2CSLST & 0x20)
{
I2CSLST &= ~0x20; //Handle the RECV event
if (isda)
{
isda = 0; //Handle the RECV event (RECV DEVICE ADDR)
}
else if (isma)
{
isma = 0; //Handle the RECV event (RECV MEMORY ADDR)
addr = I2CRXD;
I2CTXD = buffer[addr];
}
else
{
buffer[addr++] = I2CRXD; //Handle the RECV event (RECV DATA)
}
}
else if (I2CSLST & 0x10)
{
I2CSLST &= ~0x10; //Handle the SEND event
if (I2CSLST & 0x02)
{
I2CTXD = 0xff; //Stop receiving data when receiving NAK
}
else
{
I2CTXD = buffer[++addr]; //Continue reading data when receiving ACK
}
}
else if (I2CSLST & 0x08)
{
I2CSLST &= ~0x08; //Handle the STOP event
isda = 1;
isma = 1;
}
}
}
Assembly code
;Operating frequency for test is 11.0592MHz
P_SW2 DATA 0BAH
I2CCFG XDATA 0FE80H
I2CMSCR XDATA 0FE81H
I2CMSST XDATA 0FE82H
I2CSLCR XDATA 0FE83H
I2CSLST XDATA 0FE84H
I2CSLADR XDATA 0FE85H
I2CTXD XDATA 0FE86H
I2CRXD XDATA 0FE87H