R01UH0823EJ0100 Rev.1.00
Page 824 of 1823
Jul 31, 2019
RX23W Group
30. Watchdog Timer (WDTA)
lists the counter values for the window start and end positions and
period set by the RPSS[1:0], RPES[1:0], and TOPS[1:0] bits.
Figure 30.2
RPSS[1:0] and RPES[1:0] Bit Settings and the Refresh-Permitted Period
Table 30.3
Relationship between Timeout Period and Window Start and End Counter Values
TOPS[1:0] Bits
Timeout Period
Window Start and End Counter Value
Cycles
Counter Value
100%
75%
50%
25%
0
0
1024
03FFh
03FFh
02FFh
01FFh
00FFh
0
1
4096
0FFFh
0FFFh
0BFFh
07FFh
03FFh
1
0
8192
1FFFh
1FFFh
17FFh
0FFFh
07FFh
1
1
16384
3FFFh
3FFFh
2FFFh
1FFFh
0FFFh
Window
Start
(%)
End
1
25
Note: If window end setting
window start setting, the window end setting
is set to 0%.
0%
Refresh-permitted period
Underflow
100%
75%
50%
25%
100
75
50
Counting
started
RPSS[1:0] Bits
RPES[1:0] Bits
1
Refresh-prohibited period
(%)
1
1
1
0
0
0
0
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
0
25
50
75
0
25
50
75
0
25
50
75
0
25
50
75
b13
b9
b12
b8