Oscillation Stabilizing Time; Oscillation Stabilizing Time Of The On-Chip Crystal Oscillator; Oscillation Stabilizing Time Of The Pll Circuit - Renesas RZ/A Series User Manual

RZ/A1L Group, RZ/A1LU Group, RZ/A1LC Group
6.7

Oscillation Stabilizing Time

6.7.1

Oscillation Stabilizing Time of the On-chip Crystal Oscillator

In the case of using a crystal resonator, wait for the oscillation stabilizing time of the on-chip oscillation circuit at the
following cases, to keep the oscillation stabilizing time of the on-chip crystal oscillator (in the case of inputting an
external clock input, it is not necessary).
• Power on
• Releasing the software standby mode or deep standby mode by RES pin
• Changing from halting oscillation to running oscillation by power-on reset or register setting (AUDIO_X1)
• Changing from halting oscillation to running oscillation by register setting (RTC_X1)
• Changing the gain of the on-chip crystal oscillator by RES pin (EXTAL)
6.7.2

Oscillation Stabilizing Time of the PLL circuit

The clock from EXTAL is supplied to the PLL circuit. So, regardless of whether using a crystal resonator or inputting an
external clock from EXTAL, wait for at least the oscillation stabilizing time at the following cases, to keep the oscillation
stabilizing time of the PLL circuit.
• Power on (in the case of using the crystal resonator)/start inputting external clock (in the case of inputting the
external clock)
• Releasing the software standby mode or deep standby mode by RES pin
[Remarks]
The oscillation stabilizing time is kept by the counter running in the LSI at the following cases.
• Releasing the software standby mode or deep standby mode by the other than RES pin
• Changing the gain of the on-chip crystal oscillator by the register setting (EXTAL)
R01UH0437EJ0600 Rev.6.00
Jan 29, 2021
6. Clock Pulse Generator
6-12