Renesas RX Series User Manual

R01UH0823EJ0100 Rev.1.00 Page 825 of 1823
Jul 31, 2019
RX23W Group 30. Watchdog Timer (WDTA)
30.2.3 WDT Status Register (WDTSR)
Note 1. Only 0 can be written to clear the flag.
CNTVAL[13:0] Bits (Down-Counter Value)
Read these bits to confirm the value of the down-counter, but note that the read value may differ from the actual count by
a value of one count.
UNDFF Flag (Underflow Flag)
Read this flag to confirm whether or not an underflow has occurred in the down-counter.
The value 1 indicates that the down-counter has underflowed. The value 0 indicates that the down-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)
Read this flag to confirm whether or not a refresh error (performing a refresh operation during a refresh-prohibited
period) has occurred.
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): 0008 8024h
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
REFEF UNDFF CNTVAL[13:0]
Value after reset:
0000000000000000
Bit Symbol Bit Name Description R/W
b13 to b0 CNTVAL[13:0] Down-Counter Value Value counted by the down-counter R
b14 UNDFF Underflow Flag 0: No underflow occurred
1: Underflow occurred
R(/W)
*
1
b15 REFEF Refresh Error Flag 0: No refresh error occurred
1: Refresh error occurred
R(/W)
*
1

Renesas RX Series Specifications

General

Brand	Renesas
Model	RX Series
Category	Microcontrollers
Language	English