DF2148RTE20IV Renesas Electronics America, DF2148RTE20IV Datasheet - Page 453

• Manufacturer Part Number: DF2148RTE20IV
• Description: MCU 5V 128K I-TEMP,PB-FREE, 100-
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2100r

Specifications of DF2148RTE20IV

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: Host Interface, I²C, IrDA, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 74
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

14.1
This LSI have an on-chip watchdog timer with two channels (WDT0, WDT1) for monitoring
system operation. The WDT outputs an overflow signal (RESO) 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 or internal NMI interrupt signal.
When this watchdog function is not needed, the WDT can be used as an interval timer. In interval
timer mode, an interval timer interrupt is generated each time the counter overflows.
14.1.1
WDT features are listed below.
Switchable between watchdog timer mode and interval timer mode
Internal reset or internal interrupt generated when the timer counter overflows
RESO output in watchdog timer mode
Choice of 8 (WDT0) or 16 (WDT1) counter input clocks
WOVI interrupt generation in interval timer mode
Choice of internal reset or NMI interrupt generation in watchdog timer mode
In watchdog timer mode, a low-level signal is output from the RESO pin when the counter
overflows (when internal reset is selected)
Maximum WDT interval: system clock period
Subclock can be selected for the WDT1 input counter
Maximum interval when the subclock is selected: subclock period 256
Overview
Features
Section 14 Watchdog Timer (WDT)
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Section 14 Watchdog Timer (WDT)
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