Yes. Oki’s ML67Q4050/4060 Series of Advantage Microcontrollers have a built-in Ring-Oscillator that can be used for quick startup. The Ring-Oscillator can be enabled or disabled in hardware by setting the voltage level of the BOOTCLK pin of the MCU during System Reset. If the BOOTCLK pin of the MCU is at “Low” level during reset, the MCU will operate on Ring-Oscillator immediately after reset. If the BOOTCLK pin of the MCU is at “High level during reset, the MCU will operate on the SYSCLK input immediately after Power-On.