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TMS320F280049C: F280049的时钟配置

Part Number: TMS320F280049C

if(((clock_source & 0x3) != ClkCfgRegs.CLKSRCCTL1.bit.OSCCLKSRCSEL) ||
(((clock_source & 0x4) >> 2) != ClkCfgRegs.XTALCR.bit.SE))
{
switch (clock_source)
{
case INT_OSC1:
SysIntOsc1Sel();
break;

case INT_OSC2:
SysIntOsc2Sel();
break;

case XTAL_OSC:
SysXtalOscSel();
break;

case XTAL_OSC_SE:
SysXtalOscSESel();
break;
}
}

想请问一下,XTAL_OSC_SE和XTAL_OSC有什么区别