CHBEXT
if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
if (r3 & CHBEXT)
if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
if (r3 & CHBEXT)
if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
if (r3 & CHBEXT)
if (zs_intreg & CHBEXT)