TC35680FSG datasheet(25/91 Pages) TOSHIBA

25 / 91 page

TC35680FSG-002/TC35681FSG-002

2019-04-04

HCI Mode

In the HCI mode, a host CPU controls TC35680/TC35681 using the HCI commands and the Extended HCI commands which are

stored in the built-in firmware. The host CPU is connected to TC35680/TC35681 with the UART interface. The HCI mode is used for

the following purposes;



TC35680/TC35681 are controlled using the HCI commands and the Extended HCI commands.



Bluetooth® Qualification test and Radio Frequency (RF) Certification test in different countries and regions.



A user application program (firmware) is programmed to the built-in Flash memory.



RF test is done.



The operating mode is changed by the HCI command.

The program for the HCI mode is stored in the mask ROM as a built-in firmware. So, in HCI mode, the TC35680/TC35681 do not

execute a user application program which is executed by the CPU of the TC35680/TC35681. After start-up, the GPIO5 pin (UART1-

TX) and the GPOO6 pin (UART1-RX) are assigned to the UART interface pins by the built-in firmware.

The initial setting of the UART interface in the HCI mode is shown in Table 3-2.

Table 3-2 Initial setting of UART interface in HCI mode

Baud rate

115.2 kbps

Parity bit

None

Data length

8 bits

Stop bit

1 bit

Flow control

None

Protocol

HCI

Complete Mode

After start-up in the HCI mode, a proper command can switch to the Complete mode. Then a TCU command can be used to control

the system. The TCU command is a control API in the GATT/SM layer, and it is stored in the mask ROM.

The HCI_SET_MODE command is used to switch the HCI mode to the Complete mode.

User-App Mode

In the User-App mode, a user application program is executed by the CPU in TC35680/TC35681. The user application program can

use the Bluetooth® Low Energy protocol stack and a hardware control API in the built-in firmware. In this document, the control

function that can be used in the User-App mode is described as “API”.

TC35680/TC35681 download a user application program with one of the following methods, and execute the program.



Download of the user application program which is stored in the built-in Flash memory (TC35680) or an external EEPROM

(TC35681) in the proper format



Download of a user application program from the host CPU via the UART interface

The storage memory of a user application program is the built-in Flash memory in TC35680 or an external EEROM for T35681.

TC35681 and the EEPROM should be connected with the I2C interface (GPIO7 and GPIO8).

A user application program cannot occupy all resources of the CPU. The built-in firmware also uses resources of the CPU. So user

should fully evaluate that a desired functions are executed as expected and the performance reaches the target level.

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