R01UH0823EJ0100 Rev.1.00
Page 837 of 1823
Jul 31, 2019
RX23W Group
31. Independent Watchdog Timer (IWDTa)
31.2.2
IWDT Control Register (IWDTCR)
There are some restrictions on writing to the IWDTCR register. For details, refer to
Writing to the IWDTCR, IWDTRCR, and IWDTCSTPR Registers
.
In auto-start mode, the settings in the IWDTCR register are disabled, and the settings in option function select register 0
(OFS0) are enabled. The bit setting made to the IWDTCR register can also be made in the OFS0 register. For details,
refer to
section 31.3.8, Correspondence between Option Function Select Register 0 (OFS0) and IWDT
.
Address(es): IWDT.IWDTCR 0008 8032h
b15
b14
b13
b12
b11
b10
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
—
—
RPSS[1:0]
—
—
RPES[1:0]
CKS[3:0]
—
—
TOPS[1:0]
Value after reset:
0
0
1
1
0
0
1
1
1
1
1
1
0
0
1
1
Bit
Symbol
Bit Name
Description
R/W
b1, b0
Timeout Period Select
b1 b0
0 0: 128 cycles (007Fh)
0 1: 512 cycles (01FFh)
1 0: 1024 cycles (03FFh)
1 1: 2048 cycles (07FFh)
R/W
b3, b2
—
Reserved
These bits are read as 0. Writing to these bits has no effect.
R
b7 to b4
Clock Divide Ratio Select
b7 b4
0 0 0 0: No division
0 0 1 0: Divide-by-16
0 0 1 1: Divide-by-32
0 1 0 0: Divide-by-64
1 1 1 1: Divide-by-128
0 1 0 1: Divide-by-256
Other settings are prohibited.
R/W
b9, b8
Window End Position Select
b9 b8
0 0: 75%
0 1: 50%
1 0: 25%
1 1: 0% (window end position is not specified.)
R/W
b11, b10
—
Reserved
These bits are read as 0. Writing to these bits has no effect.
R
b13, b12
Window Start Position Select
b13 b12
0 0: 25%
0 1: 50%
1 0: 75%
1 1: 100% (window start position is not specified.)
R/W
b15, b14
—
Reserved
These bits are read as 0. Writing to these bits has no effect.
R