DF3048BVX25V Renesas Electronics America, DF3048BVX25V Datasheet - Page 469

• Manufacturer Part Number: DF3048BVX25V
• Description: MCU 3/5V 128K PB-FREE 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Hr

Specifications of DF3048BVX25V

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 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 H8/3048B Group 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.
The entire chip can be reset internally by a reset signal output from the watchdog timer.
The reset signal generated by timer counter overflow during watchdog timer operation resets
the entire chip internally. In an H8/3048F-ONE (single power supply with flash memory), the
RESO pin acts as the FWE pin; no external reset signal can be output.
/2, /32, /64, /128, /256, /512, /2048, or /4096
Overview
Features
Section 12 Watchdog Timer
Rev. 3.00 Sep 27, 2006 page 441 of 872
Section 12 Watchdog Timer
REJ09B0325-0300