R01UH0823EJ0100 Rev.1.00
Page 840 of 1823
Jul 31, 2019
RX23W Group
31. Independent Watchdog Timer (IWDTa)
31.2.3
IWDT Status Register (IWDTSR)
Note 1. Only 0 can be written to clear the flag.
The IWDTSR register is initialized by the reset source of the IWDT. The IWDTSR register is not initialized by other
reset sources.
CNTVAL[13:0] Bits (Counter Value)
These bits are used to confirm the counter value of the counter, but note that the read value may differ from the actual
count by a value of one count.
This bit is used to confirm whether or not an underflow has occurred in the counter.
The value 1 indicates that the counter has underflowed. The value 0 indicates that the counter has not underflowed.
Write 0 to the UNDFF flag to set the value to 0. Writing 1 has no effect.
REFEF Flag (Refresh Error Flag)
This bit is used to confirm whether or not a refresh error (performing a refresh operation during a refresh-prohibited
period).
The value 1 indicates that a refresh error has occurred. The value 0 indicates that no refresh error has occurred.
Write 0 to the REFEF flag to set the value to 0. Writing 1 has no effect.
Address(es): IWDT.IWDTSR 0008 8034h
b15
b14
b13
b12
b11
b10
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
REFEF UNDFF
CNTVAL[13:0]
Value after reset:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit
Symbol
Bit Name
Description
R/W
b13 to b0
Counter Value
Value counted by the counter
R
b14
Underflow Flag
0: No underflow occurred
1: Underflow occurred
R/(W)
*
b15
Refresh Error Flag
0: No refresh error occurred
1: Refresh error occurred
R/(W)
*