CMS32L051 User Manual |Chapter 4 Clock Generation Circuit
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(3)
Low-speed internal oscillator clock (low-speed OCO).
Clock oscillation of f
IL
=15kHz can be made.
You can use the low-speed internal oscillator clock as the system clock.
When option byte (000C0H) bit4 (WDTON) or the subsystem clock provides a mode control register
(OSMC) of bit4 (WUTMMCK0). The low-speed internal oscillator oscillates when it is 1 or when bit0
(SELLOSC) of the subsystem clock selection register (SUBCKSEL) is 1.
However, bit0() on the WDTON bit is 1 and the WUTMMCK0 bit is 0 and the option byte (000C0H).
WDSTBYON) is 0, if you enter deep sleep mode or sleep mode, the low-speed internal oscillator stops
oscillating.
Note that the low-speed internal oscillator clock (f
IL
) can only be selected as the count clock for the real-time clock when
using the fixed-period interrupt function.
Note f
X
: X1 clock oscillation frequency
f
HOCO
: Clock frequency of a high-speed internal oscillator).
f
ISH
: The clock frequency of the high-speed internal oscillator
f
EX
: External master system clock frequency
f
XT
: XT1 clock oscillation frequency
f
EXS
: External subsystem clock frequency
f
IL
: The clock frequency of the low-speed internal oscillator
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