TC35680FSG datasheet(67/91 Pages) TOSHIBA

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TC35680FSG-002/TC35681FSG-002

2019-04-04

4.16. Auto-patch Function

TC35680/TC35681 provides an auto-patch function which is executed by the built-in firmware in the boot-up sequence.

The auto-patch programs should be stored in the built-in Flash memory or an external EEPROM together with a user application

program. This function is available in the User-App mode (TC35680 and TC35681) and the HCI mode (TC35680 only). TC35681 in

the HCI mode can be patched by the HCI command.

Table 4-17 shows the availability of the auto-patch function in each operating mode.

Table 4-17 Availability of the auto-patch function

Operating mode

HCI mode

Complete mode

User-App mode

TC35680

Yes

TC35681

Yes

The auto-patch function is executed by the built-in firmware in the following cases;



During assertion of the hardware reset



During assertion of the software reset



During assertion of the reset by the watchdog timer



Return procedure from the Deep Sleep mode

To activate the auto-patch function, the entry of the auto patch program should be done to a corresponding address in the built-in

Flash memory. A desired value can be written in the RAM or a register at start-up before a host CPU or a user application program

acquires the permission to control TC35680/TC35681.

This function is effective when a desired value should be written to the register for the adjustment of the clock frequency of the

oscillator before the system is started up, and others.

4.17. Patch Function

The patch function is effective for repairing or improving the built-in firmware.

It is available in the HCI mode, the Complete mode, and the User-App mode. This function enables the modification of data in desired

addresses in the memory space including the mask ROM. The size of the modification data is 32 Bytes.

We provides the patch programs in the source code. A necessary patch program should be selected and embedded to the proper

locations in a user application program. The TC35680/TC35681 support 4 patch programs at maximum. The auto-patch programs

are not included in this number.

4.18. CPU

The Arm® Cortex®-M0 processor is embedded in TC35680/TC35681.

The CPU in TC35680/TC35681 uses the reference clock. The clock frequency is 32 MHz at start-up.

API “SYS_API_ChangeSystemClock()” can select the clock frequency of 16 MHz or 32 MHz dynamically.

The 16MHz clock can be used only when the Bluetooth® connection of the advertising function does not operate.

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