TCON_START
tcon &= ~TCON_START(channel);
tcon &= ~(TCON_START(tcon_chan) | TCON_AUTORELOAD(tcon_chan));
tcon |= TCON_START(channel);
tcon &= ~TCON_START(tcon_chan);
tcon |= TCON_START(tcon_chan) | TCON_AUTORELOAD(tcon_chan);