Renesas provides a recommended PCB layout guide in the SLG46121V application note (Document Number: R01DS0243EJ0100). It's essential to follow this guide to ensure optimal performance, minimize noise, and reduce electromagnetic interference (EMI).
To achieve the best clock accuracy, set the internal oscillator to the 'High-Frequency' mode (HFMODE = 1) and use the 'Auto-Trim' function (ATRIM = 1). This will automatically adjust the oscillator frequency to the optimal value. Refer to the SLG46121V user manual for more details.
The maximum allowed voltage on the GPIO pins is VCC + 0.5V. Exceeding this voltage may damage the device. Ensure that the voltage on the GPIO pins does not exceed the recommended maximum voltage to prevent damage or malfunction.
To implement a WDT reset, set the WDT enable bit (WDTE = 1) and configure the WDT timeout period using the WDT prescaler (WDTPS) and WDT counter (WDTCT). When the WDT counter reaches zero, the device will reset. Refer to the SLG46121V user manual for more details on WDT configuration.
The POR timeout period is approximately 10ms. During this time, the device will hold the reset signal active to ensure that the internal voltage regulators have sufficient time to stabilize.
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