Low-Speed On-Chip Oscillator Control Register (Lococr) - Renesas RX100 Series User Manual

RX13T Group
9.2.6

Low-Speed On-Chip Oscillator Control Register (LOCOCR)

Address(es): 0008 0034h
b7 b6
— —
0 0
Value after reset:
Bit Symbol
b0 LCSTP
b7 to b1 —
Note: Set the PRCR.PRC0 bit to 1 (write enabled) before rewriting this register.
LCSTP Bit (LOCO Stop)
This bit runs or stops the LOCO.
After the setting of the LCSTP bit has been changed so that the LOCO operates, only start using the LOCO clock after
the LOCO clock oscillation stabilization time (t
That is, a fixed time for stabilization of oscillation is required after the setting for LOCO operation. A fixed time is also
required for oscillation to stop after the setting to stop the oscillator. Accordingly, take note of the following limitations
when starting and stopping the oscillator.
 When restarting the LOCO after it has been stopped, allow at least five cycles of the LOCO as an interval over
which it is still stopped.
 Ensure that oscillation by the LOCO is stable when making the setting to stop the LOCO.
 Regardless of whether or not it is selected as the system clock, ensure that oscillation by the LOCO is stable before
executing a WAIT instruction to place the chip on software standby.
 When a transition to software standby mode is to follow the setting to stop the LOCO, wait for at least three cycles
of the LOCO after the setting to stop the LOCO and before executing the WAIT instruction.
While the LOCO is selected by the SCKCR3.CKSEL[2:0] bits, do not set the LCSTP bit to 1 (LOCO is stopped).
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
b5 b4 b3 b2
— — — —
0 0 0 0
Bit Name
LOCO Stop
Reserved
LOCO
b1 b0
— LCSTP
0 0
Description
0: LOCO is operating.
1: LOCO is stopped.
These bits are read as 0. The write value should be 0.
) has elapsed.
9. Clock Generation Circuit
R/W
R/W
R/W
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