r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 552

• Manufacturer Part Number: r5f71374an80fpv
• Description: 32-bit Risc Microcomputer Superh?? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

Section 13 Watchdog Timer (WDT)
13.3
The WDT has the following two registers. Refer to section 25, List of Registers, for the details of
the addresses of these registers and the state of registers in each operating mode.
Table 13.2 Register Configuration
13.3.1
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
Rev. 1.00 Sep. 21, 2007 Page 526 of 1124
REJ09B0402-0100
Register Name
Watchdog timer counter
Watchdog timer control/status
register
13.3.3, Notes on Register Access, for details.
Register Descriptions
Watchdog Timer Counter (WTCNT)
Initial value:
R/W:
Bit:
R/W
Abbrevia-
tion
WTCNT
WTCSR
7
0
R/W
6
0
R/W
5
0
R/W
R/W
R/W
R/W
4
0
Initial Value
H'00
H'00
R/W
3
0
R/W
2
0
R/W
1
0
Address
H'FFFFE810
H'FFFFE812
R/W
0
0
Access Size
8, 16
8, 16