HD6417706F133 Renesas Electronics America, HD6417706F133 Datasheet - Page 365

• Manufacturer Part Number: HD6417706F133
• Description: IC SUPERH MPU ROMLESS 176LQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417706F133

• Core Processor: SH-3
• Core Size: 32-Bit
• Speed: 133MHz
• Connectivity: EBI/EMI, FIFO, SCI, SmartCard
• Peripherals: DMA, POR, WDT
• Number Of I /o: 103
• Program Memory Type: ROMless
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.75 V ~ 2.05 V
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 176-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

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
Interrupt
Legend:
WTCSR: Watchdog timer control/status register
WTCNT: Watchdog timer counter
Standby
Internal
request
request
Section 11 Watchdog Timer (WDT)
reset
Figure 11.1 Block Diagram of the WDT
Standby
Interrupt
control
control
control
Reset
WTCSR
Clock selection
Overflow
Bus interface
WDT
WTCNT
Rev. 5.00 May 29, 2006 page 315 of 698
Clock selector
Section 11 Watchdog Timer (WDT)
Divider
1/4096) can be obtained by
Clock
Standby
mode
Peripheral
clock
REJ09B0146-0500