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TC35680FSG-002/TC35681FSG-002

2019-04-04

4.6.6.2. Wake-up in Sleep Mode or Backup Mode

The ANYKEY wake-up function has some known issue. The issue and their countermeasures are summarized in Known Issues

which a user should refer to.

Every GPIO pin can receive a signal to wake up TC35680/TC35681 in the Sleep mode or the Backup mode (ANYKEY wake-up).

The ANYKEY wake-up function is available in the User-App mode (in the HCI mode, it is disabled).

Table 4-5 shows the interrupt setting, the getting interrupt cause, the interrupt cause clear, and the API of the call-back function for

ANYKEY wake-up.

The ANYKEY wake-up can be set by the HCI command or the API in Table 4-5, and one of the following detections of the interrupt

request can be assigned to the pin.



Edge detection of the interrupt request (a rising edge, a falling edge, or both edges)



Interrupt disable (No detection)

When the external wake-up request is detected before the transition to a low power mode, the wake-up sequence begins after the

transition completes.

It should be noted that the ANYKEY wake-up is detected when the ANYKEY wake-up is set in the following conditions;



The wake-up is set within 2 clock cycles (= 1/fSLEEPCLK× 2) after the oscillation of the sleep clock becomes stable.



The rising edge detection is set while the external input is High to the pin.



The falling edge detection is set while the external input is Low to the pin.

When an ANYKEY wake-up interrupt is detected, the interval of 1/fSLEEPCLK or more is necessary to accept the next interrupt.

Table 4-5 Getting interrupt cause, clearing, and Call-back function for ANYKEY wake-up

Item

API

Interrupt setting

SYS_API_SetWakeInt()

Getting interrupt cause

SYS_API_GetWakeUpCauseValue()

Interrupt cause clear

The cause is cleared automatically by the built-in firmware.

Call-back function

SYS_API_SetCallbackPMUTimInt()

The GPIO0 or GPIO15 wake-up function described next is available in the Sleep mode, the Backup mode, and the Deep Sleep

mode.

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