R0K572011S000BE Renesas Electronics America, R0K572011S000BE Datasheet - Page 656

• Manufacturer Part Number: R0K572011S000BE
• Description: KIT STARTER FOR SH7201
• Manufacturer: Renesas Electronics America
• Series: Renesas Starter Kits (RSK)r
• Type: MCUr

Specifications of R0K572011S000BE

• Contents: CPU Board, LCD Display Module, E8 Emulator, Cable, QuickStart Guide and CD-ROM
• For Use With/related Products: SH7201
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Section 14 Watchdog Timer (WDT)
14.3.2
WTCSR is an 8-bit readable/writable register composed of bits to select the clock used for the
count, overflow flags, and timer enable bit.
WTCSR is initialized to H'18 by a power-on reset caused by the RES pin or in deep standby mode
or software standby mode. When used to count the clock oscillation settling time for canceling
software standby mode, it retains its value after counter overflow.
Use word access to write to WTCSR, writing H'A5 in the upper byte. Use byte access to read from
WTCSR.
Note: The method for writing to WTCSR differs from that for other registers to prevent
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Bit
7
6
erroneous writes. See section 14.3.4, Notes on Register Access, for details.
Watchdog Timer Control/Status Register (WTCSR)
Bit Name
IOVF
WT/IT
Initial value:
Initial
Value
0
0
R/W:
Bit:
R/(W)
IOVF WT/IT TME
0
7
R/W
R/(W)
R/W
R/W
0
6
R/W
Description
Interval Timer Overflow
Indicates that WTCNT has overflowed in interval timer
mode. This flag is not set in watchdog timer mode.
0: No overflow
1: WTCNT overflow in interval timer mode
[Clearing condition]
•
Timer Mode Select
Selects whether to use the WDT as a watchdog timer
or an interval timer.
0: Use as interval timer mode
1: Use as watchdog timer mode
Note: When the WTCNT overflows in watchdog timer
0
5
When 0 is written to IOVF after reading IOVF
—
R
1
4
mode, the WDTOVF signal is output externally.
If this bit is modified when the WDT is running,
the up-count may not be performed correctly.
—
1
R
3
R/W
0
2
CKS[2:0]
R/W
1
0
R/W
0
0
R01UH0026EJ0300 Rev. 3.00
SH7201 Group
Sep 24, 2010