DF3052BX25V Renesas Electronics America, DF3052BX25V Datasheet - Page 453

• Manufacturer Part Number: DF3052BX25V
• Description: MCU 5V 512K 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Hr

Specifications of DF3052BX25V

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

12.1
The H8/3052BF has an on-chip watchdog timer (WDT). The WDT has two selectable functions: it
can operate as a watchdog timer to supervise system operation, or it can operate as an interval
timer. As a watchdog timer, it generates a reset signal for the chip if a system crash allows the
timer counter (TCNT) to overflow before being rewritten. In interval timer operation, an interval
timer interrupt is requested at each TCNT overflow.
12.1.1
WDT features are listed below.
Selection of eight counter clock sources
Interval timer option
Timer counter overflow generates a reset signal or interrupt.
The reset signal is generated in watchdog timer operation. An interval timer interrupt is
generated in interval timer operation.
Watchdog timer reset signal resets the entire chip internally.
The reset signal generated by timer counter overflow during watchdog timer operation resets
the entire chip internally.
With the H8/3052BF, a reset signal cannot be output externally.
/2, /32, /64, /128, /256, /512, /2048, or /4096
Overview
Features
Section 12 Watchdog Timer
Rev. 3.00 Mar 21, 2006 page 423 of 814
Section 12 Watchdog Timer
REJ09B0302-0300