R5F21264JFP#W4 - Renesas Electronics

R5F21264JFP#W4 Frequently Asked Questions (FAQs)

• What is the recommended power-on sequence for the R5F21264JFP#W4?
  The recommended power-on sequence is to apply VCC first, followed by VDD, and then the clock signal. This ensures that the internal voltage regulators and clock circuitry are properly initialized.
• How do I handle the JTAG interface during reset?
  During reset, the JTAG interface should be tri-stated to prevent any unwanted data from being driven onto the JTAG pins. This can be done by setting the JTAG pins as inputs or by using an external buffer to isolate the JTAG interface.
• What is the maximum allowed clock skew between the CPU clock and the peripheral clocks?
  The maximum allowed clock skew between the CPU clock and the peripheral clocks is 1 clock cycle. This ensures that the CPU and peripherals are properly synchronized and that data is transferred correctly.
• How do I implement a watchdog timer reset?
  To implement a watchdog timer reset, connect the watchdog timer output to the reset pin of the R5F21264JFP#W4. When the watchdog timer expires, it will assert the reset signal, which will reset the device.
• What is the recommended decoupling capacitor value for the VCC and VDD power pins?
  The recommended decoupling capacitor value for the VCC and VDD power pins is 0.1uF to 1uF, depending on the specific application and operating conditions. This helps to filter out noise and ensure stable power supply to the device.