HD6417706 RENESAS [Renesas Technology Corp], HD6417706 Datasheet - Page 349

• Manufacturer Part Number: HD6417706
• Description: Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

The WDT is a single-channel timer that counts the clock settling time and is used when clearing
software standby mode and temporary standbys, such as frequency changes. It can also be used as
an ordinary watchdog timer or interval timer.
Figure 11.1 shows a block diagram of the WDT.
11.1
The WDT has the following features:
Can be used to ensure the clock setting time: Use the WDT to cancel software standby mode
and the temporary standbys that occur when the clock frequency is changed.
Can switch between watchdog timer mode and interval timer mode.
Generates internal resets in watchdog timer mode: Internal resets occur after counter overflow.
Selection of power-on reset or manual reset.
Generates interrupts in interval timer mode: Internal timer interrupts occur after counter
overflow.
Selection of eight counter input clocks. Eight clocks ( 1 to
dividing the peripheral clock.
Feature
cancellation
WTCSR:
WTCNT:
Legend
Standby
Interrupt
Internal
request
request
Section 11 Watchdog Timer (WDT)
reset
Watchdog timer control/status register
Watchdog timer counter
Figure 11.1 Block Diagram of the WDT
Standby
Interrupt
control
control
control
Reset
WTCSR
Clock selection
Overflow
Bus interface
WDT
WTCNT
Clock selector
Divider
1/4096) can be obtained by
Rev. 4.00, 03/04, page 303 of 660
Clock
Standby
mode
Peripheral
clock