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Figure 2

shows the firmware flowchart.

Initialize WDT interrupt

WDT interrupt

Initialize and enable

Enable global interrupts

Put CM4 to Deep Sleep

and wait for WDT

Design Considerations

This code example is designed to run on CY8CKIT-062-BLE with the PSoC 6 MCU. To port the design to other PSoC 6 MCU

and kits, change the target device in Device Selector, and change the pin assignments in the cydwr settings. For single-core

PSoC 6 MCU devices, port the code from main_cm4.c to main.c file because CM0+ CPU is not used in this code example.

Hardware Setup

The code example works with the default settings on the CY8CKIT-062-BLE PSoC 6 BLE Pioneer Kit. If the settings are

different from the default values, see the "Selection Switches" table in the

Make sure that the switch "SW5" is set to select "3.3V" as VDD on the CY8CKIT-062-BLE PSoC 6 BLE Pioneer Kit.

Operation

Connect CY8CKIT-062 BLE to a USB port on your PC.

Build and program the application into CY8CKIT-062 BLE. For more information on building a project or programming a

device, see PSoC Creator Help.

Observe the GREEN_LED to determine the status of the WDT interrupt.

Components

Table 1

lists the PSoC Creator Components used in this example and the hardware resources used by each Component.

Component

Global Signal Reference (GSRef)

System Interrupt (SysInt)

General Purpose Input / Output (GPIO)

www.cypress.com

Figure 2. Firmware Flowchart

Start

initialization

successful?

YES

Turn ON RED_LED

WDT

Stay in an infinite loop

interrupt

Table 1. PSoC Creator Components

Instance Name

GlobalSignal_1

WDTIsr

RED_LED, GREEN_LED

Document No. 002-20607 Rev.*A

PSoC 6 MCU Watchdog Timer in Interrupt Mode

WDTIsr

WDT interrupt?

YES

Service WDT interrupt (Clear WDT interrupt

and

Toggle GREEN_LED)

Return

kit guide

to reset to the default settings.

Hardware Resources

None

One entry in the device interrupt vector table

Two physical pins