DF71251AD50FPV Renesas Electronics America, DF71251AD50FPV Datasheet - Page 423

• Manufacturer Part Number: DF71251AD50FPV
• Description: MCU RISC FLASH 32K 8K 64LQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH Tinyr

Specifications of DF71251AD50FPV

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 37
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

This LSI includes the watchdog timer (WDT).
This LSI can be reset by the overflow of the counter when the value of the counter has not been
updated because of a system runaway.
The watchdog timer (WDT) is a single-channel timer that uses a peripheral clock as an input and
counts the clock settling time when clearing software standby mode. It can also be used as an
interval timer.
11.1
• Can be used to ensure the clock settling time: Use the WDT to revoke software standby mode.
• Can switch between watchdog timer mode and interval timer mode.
• Generates internal resets in watchdog timer mode: Internal resets occur after counter overflow.
• An interrupt is generated in interval timer mode
• Choice of eight counter input clocks
• Choice of two resets
WDTS300B_000020030200
An interval timer interrupt is generated when the counter overflows.
Eight clocks (×1 to ×1/4096) that are obtained by dividing the peripheral clock can be chosen.
Power-on reset and manual reset are available.
Features
Section 11 Watchdog Timer (WDT)
Rev. 5.00 Mar. 06, 2009 Page 403 of 770
REJ09B0243-0500