Example Of Setting X1 Oscillation Clock - Renesas RL78/G13 User Manual

16-bit single-chip microcontrollers

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5.6.2 Example of setting X1 oscillation clock

After a reset release, the CPU/peripheral hardware clock (f

oscillator clock. To subsequently change the clock to the X1 oscillation clock, set the oscillator and start oscillation by

using the oscillation stabilization time select register (OSTS) and clock operation mode control register (CMC) and clock

operation status control register (CSC) and wait for oscillation to stabilize by using the oscillation stabilization time counter

status register (OSTC). After the oscillation stabilizes, set the X1 oscillation clock to f

[Register settings] Set the register in the order of <1> to <5> below.

<1> Set (1) the OSCSEL bit of the CMC register, except for the cases where the frequency is equal or more than

10MHz, in such cases set (1) the AMPH bit, to operate the X1 oscillator.

AMPH bit: Set this bit to 0 if the X1 oscillation clock is 10 MHz or less.

<2> Using the OSTS register, select the oscillation stabilization time of the X1 oscillator at releasing of the STOP mode.

Example: Setting values when a wait of at least 102.4

<3> Clear (0) the MSTOP bit of the CSC register to start oscillating the X1 oscillator.

<4> Use the OSTC register to wait for oscillation of the X1 oscillator to stabilize.

Example: Wait until the bits reach the following values when a wait of at least 102.4

<5> Use the MCM0 bit of the CKC register to specify the X1 oscillation clock as the CPU/peripheral hardware clock.

R01UH0146EJ0100 Rev.1.00

Sep 22, 2011

) always starts operating with the high-speed on-chip

s is set based on a 10 MHz resonator.

CHAPTER 5 CLOCK GENERATOR

by using the system clock control

s is set based on a 10 MHz