Section 11 Watchdog Timer (WDT)
Rev. 3.00 Sep. 27, 2007 Page 404 of 758
REJ09B0243-0300
11.3 Register
Descriptions
The WDT has the following two registers. Refer to section 20, List of Registers, for the details of
the addresses of these registers and the state of registers in each operating mode.
Table 11.2 Register Configuration
Register Name
Abbrevia-
tion
R/W
Initial Value Address
Access Size
Watchdog timer counter
WTCNT
R/W
H'00
H'FFFFE810
8, 16
Watchdog timer control/status
register
WTCSR R/W
H'00
H'FFFFE812
8,
16
11.3.1
Watchdog Timer Counter (WTCNT)
WTCNT is an 8-bit readable/writable register that increments on the selected clock. When an
overflow occurs, it generates a reset in watchdog timer mode and an interrupt in interval time
mode. The WTCNT counter is not initialized by an internal reset due to the WDT overflow. The
WTCNT counter is initialized to H'00 only by a power-on reset using the
RES
pin. Use a word
access to write to the WTCNT counter, with H'5A in the upper byte. Use a byte access to read
WTCNT.
Note: WTCNT differs from other registers in that it is more difficult to write to. See section
11.3.3, Notes on Register Access, for details.
Bit:
Initial value:
R/W:
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
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