Renesas RL78/G13 - High-Speed On-Chip Oscillator; Low-Speed On-Chip Oscillator

RL78/G13 CHAPTER 5 CLOCK GENERATOR
R01UH0146EJ0100 Rev.1.00 306
Sep 22, 2011
5.4.3 High-speed on-chip oscillator
The high-speed on-chip oscillator is incorporated in the RL78/G13. The frequency can be selected from among 32, 24,
16, 12, 8, 4, or 1 MHz by using the option byte (000C2H). Oscillation can be controlled by bit 0 (HIOSTOP) of the clock
operation status control register (CSC). The high-speed on-chip oscillator automatically starts oscillating after reset
release.
5.4.4 Low-speed on-chip oscillator
The low-speed on-chip oscillator is incorporated in the RL78/G13.
The low-speed on-chip oscillator clock is used only as the watchdog timer, real-time clock, and interval timer clock. The
low-speed on-chip oscillator clock cannot be used as the CPU clock.
This clock operates when bit 4 (WDTON) of the option byte (000C0H), bit 4 (WUTMMCK0) of the operation speed
mode control register (OSMC), or both are set to 1.
Unless the watchdog timer is stopped and WUTMMCK0 is a value other than zero, oscillation of the low-speed on-chip
oscillator continues. While the watchdog timer operates, the low-speed on-chip oscillator clock does not stop even if the
program freezes.