4.3 General Format of HCI Event Responses (BM70/71 Module to Host MCU)

The following table provides details about the general message format of the HCI event packet. All HCI event packet messages from the IS187x IC chip to the host MCU follow this format.

Table 4-3. HCI Event Response Format
StartEvent CodeLengthData
Byte Number01 23-XX
Size (bytes)1110
Value0x040xXX0xNNEvent parameters
— Pack indicator— — Length – 0xNN bytes

The type of event code message sent from the BM70/71 module to the host MCU is dependent either on the type of HCI command packet or HCI-ISDAP Flash commands sent by the host MCU. For each HCI command packet or HCI-ISDAP Flash packet, the BM70/71 module responds to the host MCU with an event response(s) based on the command received. For more details regarding the meaning and values of the parameters in the HCI event packet, refer to the Bluetooth Core Specification (4.2) and HCI Event Responses.

Note: Microchip recommends that the user study and understand the information regarding the HCI event packets available in the Bluetooth Core Specification (4.2).