AP1612

The AP1612 is designed as one kind of bootstrap loader - IDB / half duplex. And it is one member of the C166 family that does not support half duplex mode directly during bootstrap loader mode. The problem is that the receiver of the ASC0 is enabled during transmission of the IDB from the ASC0 to the host. Because of the connection of TxD0 and RxD0 (done by external hard ware in half duplex mode) the IDB is received as the first byte of the 32bytes which are expected from the bootstrap loader sent by the host.

For the C166 family devices which support half duplex mode the described workaround is not necessary (not allowed), because the receiver of the ASC0 is disabled during transmission of the IDB. Therefore it is possible to use half duplex mode. If you want to know more information such as the electrical characteristics about the AP1612, please download the datasheet in www.seekic.com or www.chinaicmart.com .