Renesas RX Series

R01UH0823EJ0100 Rev.1.00 Page 234 of 1823
Jul 31, 2019
RX23W Group 11. Low Power Consumption
 High-Speed Operating Mode
The maximum operating frequency during FLASH read is 54 MHz for ICLK, PCLKA, and PCLKD; 32 MHz for
PCLKB, and FCLK. The operating voltage range is 1.8 to 3.6 V during FLASH read. However, the maximum operating
frequency during FLASH read is 16 MHz for ICLK, FCLK, PCLKA, and PCLKB, and 32 MHz for PCLKD when the
operating voltage is 2.4 V or larger and smaller than 2.7 V. The maximum operating frequency during FLASH read is 8
MHz for all the clocks when the operating voltage is 1.8 V or larger and smaller than 2.4 V.
During FLASH programming/erasure, the operating frequency range is 1 to 32 MHz and the operating voltage range is
2.7 to 3.6 V.
The following restriction applies when high-speed operating mode is selected.
 The PLL and USB-dedicated PLL can be used when the operating voltage is 2.4 V or above.
However, the USB cannot be used when the operating voltage is below 3.0 V.
Figure 11.3 shows the operating voltages and frequencies in high-speed operating mode.
Figure 11.3 Operating Voltages and Frequencies in High-Speed Operating Mode
Note: When using the FCLK at lower than 4 MHz during programming or erasing the flash memory, the frequency can
be set to 1, 2, or 3 MHz.
[V]
3.6
2.7
2.4
1.8
0.032768 1 4 8 12 16 20 25 32 50 54
PCLKB, FCLK
[MHz]
[V]
3.6
2.7
2.4
1.8
0.032768 1 4 8 12 16 20 25 32 50 54
FCLK (P/E only)
[MHz]
[V]
3.6
2.7
2.4
1.8
0.032768 1 4 8 12 16 20 25 32 50 54
ICLK, PCLKA
[MHz]
[V]
3.6
2.7
2.4
1.8
0.032768 1 4 8 12 16 20 25 32 50 54
PCLKD
[MHz]