which register should I write among these?(to getting 8-bit)

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Hi,

I'm little confused to set registers when I want to get 8-bit RGB raw data in QCIF format. there are some registers for 8-bit data output(COMA, COMB, COMD, COMH). so, I tried to set them like this

CamConfig_setCamReg(0x12,0x38);
CamConfig_setCamReg(0x14,0x20);
CamConfig_setCamReg(0x28,0x81);
CamConfig_setCamReg(0x13,0x21);

but I'm not sure that which one I should set for getting 8-bit RGB raw data in QCIF format. I connected Y bus only.

Can anyone help me how to set register if i want to get 8-bit RGB data in QCIF format?