HD64F7144F50V Renesas Electronics America, HD64F7144F50V Datasheet - Page 425

• Manufacturer Part Number: HD64F7144F50V
• Description: IC SUPERH MCU FLASH 256K 112QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7144r

Specifications of HD64F7144F50V

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: EBI/EMI, I²C, SCI
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 74
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 112-QFP
• For Use With: HS0005KCU11H - EMULATOR E10A-USB H8S(X),SH2(A)EDK7145 - DEV EVALUATION KIT SH7145
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

The watchdog timer (WDT) is an 8-bit timer that can reset this LSI internally if the counter
overflows without rewriting the counter value due to a system crash or the like.
When this watchdog function is not needed, the WDT can be used as an interval timer. In interval
timer operation, an interval timer interrupt is generated each time the counter overflows.
The block diagram of the WDT is shown in figure 12.1.
12.1
• Switchable between watchdog timer mode and interval timer mode
In watchdog timer mode
• Output WDTOVF signal
In interval timer mode
• If the counter overflows, the WDT generates an interval timer interrupt (ITI).
• Clears software standby mode
• Selectable from eight counter input clocks.
WDT0400A_030020030800
If the counter overflows, it is possible to select whether this LSI is internally reset or not. A
power-on reset or manual reset can be selected as an in internal reset.
Features
Section 12 Watchdog Timer
Rev.4.00 Mar. 27, 2008 Page 379 of 882
12. Watchdog Timer
REJ09B0108-0400