HD64F7051SFJ20V Renesas Electronics America, HD64F7051SFJ20V Datasheet - Page 377

• Manufacturer Part Number: HD64F7051SFJ20V
• Description: MCU 5V 256K J-TEMP PB-FREE QFP-1
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7050r

Specifications of HD64F7051SFJ20V

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 20MHz
• Connectivity: EBI/EMI, SCI
• Peripherals: DMA, WDT
• Number Of I /o: 102
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 10K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 168-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

12.1
The watchdog timer (WDT) is a 1-channel timer for monitoring system operations. If a system
encounters a problem (crashes, for example) and the timer counter overflows without being
rewritten correctly by the CPU, an overflow signal (WDTOVF) is output externally. The WDT
can simultaneously generate an internal reset signal for the entire chip.
When the watchdog function is not needed, the WDT can be used as an interval timer. In the
interval timer operation, an interval timer interrupt is generated at each counter overflow. The
WDT is also used in recovering from the standby mode.
12.1.1
Works in watchdog timer mode or interval timer mode.
Outputs WDTOVF in the watchdog timer mode. When the counter overflows in the watchdog
timer mode, overflow signal WDTOVF is output externally. You can select whether to reset
the chip internally when this happens. Either the power-on reset or manual reset signal can be
selected as the internal reset signal.
Generates interrupts in the interval timer mode. When the counter overflows, it generates an
interval timer interrupt.
Clears standby mode.
Works with eight counter input clocks.
Overview
Features
Section 12 Watchdog Timer (WDT)
Rev. 5.00 Jan 06, 2006 page 355 of 818
Section 12 Watchdog Timer (WDT)
REJ09B0273-0500