R01UH0823EJ0100 Rev.1.00 Page 182 of 1823
Jul 31, 2019
RX23W Group 9. Clock Generation Circuit
9.2.10 IWDT-Dedicated On-Chip Oscillator Control Register (ILOCOCR)
Note: Set the PRCR.PRC0 bit to 1 (write enabled) before rewriting this register.
When the IWDT start mode select bit in option function select register 0 (OFS0.IWDTSTRT) is 0 (IWDT is operating),
the setting of this register is invalid; it is valid only when the OFS0.IWDTSTRT bit is set to 1 (IWDT is stopped). The
ILCSTP bit cannot be changed from 0 (IWDT-dedicated on-chip oscillator is operating) to 1 (IWDT-dedicated on-chip
oscillator is stopped) while ILOCOCR is valid.
ILCSTP Bit (IWDT-Dedicated On-Chip Oscillator Stop)
This bit runs or stops the IWDT-dedicated on-chip oscillator.
After the setting of the ILCSTP bit has been changed so that the IWDT-dedicated on-chip oscillator operates, supply of
the clock is started the MCU internally after a fixed time corresponding to the IWDT-dedicated clock oscillation
stabilization time (t
ILOCO
) has elapsed.
If the IWDT-dedicated clock is to be used, only start using the oscillator after this wait time has elapsed.
Ensure that oscillation by the IWDT-dedicated on-chip oscillator is stable before executing a WAIT instruction to place
the chip on software standby mode.
Address(es): 0008 0035h
b7 b6 b5 b4 b3 b2 b1 b0
———————ILCSTP
Value after reset:
00000001
Bit Symbol Bit Name Description R/W
b0 ILCSTP IWDT-Dedicated On-Chip
Oscillator Stop
0: IWDT-dedicated on-chip oscillator is operating.
1: IWDT-dedicated on-chip oscillator is stopped.
R/W
b7 to b1 — Reserved These bits are read as 0. The write value should be 0. R/W
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