Renesas RX Series

R01UH0823EJ0100 Rev.1.00 Page 802 of 1823
Jul 31, 2019
RX23W Group 28. Realtime Clock (RTCe)
(3) Carry interrupt (CUP)
This interrupt is generated when a carry to the second counter/binary counter 0 occurred or a carry to the R64CNT
counter occurred during read access to the 64-Hz counter.
Figure 28.12 Carry Interrupt (CUP) Timing Chart
64 Hz
1 Hz
Interrupt
Interrupt generated by the simultaneous
occurrence of the selected edge of the
64-Hz signal and register reading
R64CNT
signal
64-Hz signal in R64CNT
Detection of the selected
edge of the 64-Hz signal
Register reading by the CPU
Interrupt
(the IR flag corresponding to
the CUP interrupt
*1
)
Detail
R64CNT
Rising edges of the R64CNT signals
are detected in the same way.
An interrupt is generated by a
carry to the second counter/
binary counter 0
Interrupt generated by the simultaneous occurrence of
the edge of the 64-Hz signal and reading of R64CNT
Note 1. Refer to the Interrupt Controller section for details on the corresponding interrupt vector number.