HD64F2676VFC33 Renesas Electronics America, HD64F2676VFC33 Datasheet - Page 706

• Manufacturer Part Number: HD64F2676VFC33
• Description: IC H8S MCU FLASH 256K 144-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2600r

Specifications of HD64F2676VFC33

• Core Processor: H8S/2600
• Core Size: 16-Bit
• Speed: 33MHz
• Connectivity: IrDA, SCI
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 103
• 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 12x10b; D/A 4x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 144-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Section 14 Watchdog Timer
14.4
14.4.1
To use the WDT as a watchdog timer mode, set the WT/IT and TME bits in TCSR to 1.
If TCNT overflows without being rewritten because of a system crash or other error, the
WDTOVF signal is output.
This ensures that TCNT does not overflow while the system is operating normally. Software must
prevent TCNT overflows by rewriting the TCNT value (normally be writing H'00) before
overflow occurs. This WDTOVF signal can be used to reset the chip internally in watchdog timer
mode.
If TCNT overflows when 1 is set in the RSTE bit in RSTCSR, a signal that resets this LSI
internally is generated at the same time as the WDTOVF signal. If a reset caused by a signal input
to the RES pin occurs at the same time as a reset caused by a WDT overflow, the RES pin reset
has priority and the WOVF bit in RSTCSR is cleared to 0.
The WDTOVF signal is output for 132 states when RSTE = 1, and for 130 states when RSTE = 0.
The internal reset signal is output for 518 states.
When TCNT overflows in watchdog timer mode, the WOVF bit in RSTCSR is set to 1. If TCNT
overflows when 1 is set in the RSTE bit in RSTCSR, an internal reset signal is generated to the
entire chip.
Rev. 3.00 Mar 17, 2006 page 654 of 926
REJ09B0283-0300
Operation
Watchdog Timer Mode