Renesas RL78/G1H, User Manual

Page: 139 / 941

RL78/G1H CHAPTER 6 CLOCK GENERATOR
R01UH0575EJ0120 Rev. 1.20 Page 121 of 920
Dec 22, 2016
6.4.3 High-speed on-chip oscillator
The frequency can be selected from among 32, 24, 16, 12, 8, 6, 4, 3, 2, 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.
6.4.4 Low-speed on-chip oscillator
The low-speed on-chip oscillator clock is used only as the watchdog timer, real-time clock, 12-bit interval timer,
and timer RJ clock. The low-speed on-chip oscillator clock cannot be used as the CPU clock.
The low-speed on-chip oscillator runs while the watchdog timer is operating or when bit 4 (WUTMMCK0) in the
subsystem clock supply mode control register (OSMC) is set to 1.
The low-speed on-chip oscillator is stopped when the watchdog timer is stopped and WUTMMCK0 is set to 0.
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