R01UH0823EJ0100 Rev.1.00 Page 210 of 1823
Jul 31, 2019
RX23W Group 10. Clock Frequency Accuracy Measurement Circuit (CAC)
10. Clock Frequency Accuracy Measurement Circuit (CAC)
10.1 Overview
The clock frequency accuracy measurement circuit (CAC) counts pulses of the clock to be measured (measurement
target clock) within the time generated by the clock to be used as a measurement reference (measurement reference
clock), and determines the accuracy depending on whether the number of pulses is within the allowable range.
When measurement is completed or the number of pulses within the time generated by the measurement reference clock
is not within the allowable range, an interrupt request is generated.
Table 10.1 lists the specifications of the CAC and Figure 10.1 shows a block diagram of the CAC.
Table 10.1 CAC Specifications
Item Description
Measurement target clocks The frequency of the following clocks can be measured.
Main clock
Sub-clock
HOCO clock
LOCO clock
IWDT-dedicated clock (IWDTCLK)
Peripheral module clock B (PCLKB)
Measurement reference clocks
External clock input to the CACREF pin
Main clock
Sub-clock
HOCO clock
LOCO clock
IWDT-dedicated clock (IWDTCLK)
Peripheral module clock B (PCLKB)
Selectable function Digital filter function
Interrupt sources
Measurement end interrupt
Frequency error interrupt
Overflow interrupt
Low power consumption function Module stop state can be set.
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