R01UH0823EJ0100 Rev.1.00
Page 216 of 1823
Jul 31, 2019
RX23W Group
10. Clock Frequency Accuracy Measurement Circuit (CAC)
10.2.5
CAC Status Register (CASTR)
FERRF Flag (Frequency Error Flag)
This flag indicates deviation of the clock frequency from the set value (frequency error).
[Setting condition]
The clock frequency is outside of the setting range.
[Clearing condition]
1 is written to the CAICR.FERRFCL bit.
MENDF Flag (Measurement End Flag)
This flag indicates the end of measurement.
[Setting condition]
Measurement has finished.
[Clearing condition]
1 is written to the CAICR.MENDFCL bit.
This flag indicates that the counter has overflowed.
[Setting condition]
The counter has overflowed.
[Clearing condition]
1 is written to the CAICR.OVFFCL bit.
Address(es): 0008 B004h
b7
b6
b5
b4
b3
b2
b1
b0
—
—
—
—
—
OVFF MENDF FERRF
Value after reset:
0
0
0
0
0
0
0
0
Bit
Symbol
Bit Name
Description
R/W
b0
Frequency Error Flag
0: The clock frequency is within the range corresponding to
the settings.
1: The clock frequency has deviated beyond the range
corresponding to the settings (frequency error).
R
b1
Measurement End Flag
0: Measurement is in progress.
1: Measurement has ended.
R
b2
Overflow Flag
0: The counter has not overflowed.
1: The counter has overflowed.
R
b7 to b3
—
Reserved
These bits are read as 0. The write value should be 0.
R/W