D12312SVF20V Renesas Electronics America, D12312SVF20V Datasheet - Page 449

• Manufacturer Part Number: D12312SVF20V
• Description: IC H8S/2312S MCU ROMLESS 100QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of D12312SVF20V

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SCI, SmartCard
• Peripherals: POR, PWM, WDT
• Number Of I /o: 70
• Program Memory Type: ROMless
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-QFP
• For Use With: EDK2329 - DEV EVALUATION KIT H8S/2329
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

11.1
The chip has a single-channel on-chip watchdog timer (WDT) for monitoring system operation.
The WDT outputs an overflow signal (WDTOVF) * if a system crash prevents the CPU from
writing to the timer counter, allowing it to overflow. At the same time, the WDT can also generate
an internal reset signal for the chip.
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.
Note: * The WDTOVF function is not available in the F-ZTAT versions.
11.1.1
WDT features are listed below.
• Switchable between watchdog timer mode and interval timer mode
• WDTOVF output when in watchdog timer mode *
• Interrupt generation when in interval timer mode
• Choice of eight counter clock sources
Note: * The WDTOVF function is not available in the F-ZTAT versions.
If the counter overflows, the WDT outputs WDTOVF. It is possible to select whether or not
the entire chip is reset at the same time
If the counter overflows, the WDT generates an interval timer interrupt
Overview
Features
Section 11 Watchdog Timer
Rev.7.00 Feb. 14, 2007 page 415 of 1108
Section 11 Watchdog Timer
REJ09B0089-0700