DF2238RTF6 Renesas Electronics America, DF2238RTF6 Datasheet - Page 527

• Manufacturer Part Number: DF2238RTF6
• Description: MCU 2.2/3V 256K 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2200r

Specifications of DF2238RTF6

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 6MHz
• Connectivity: I²C, SCI, SmartCard
• Peripherals: POR, PWM, WDT
• Number Of I /o: 72
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 2.2 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: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: HD64F2238RTF6; HD64F2238RTF6

The watchdog timer (WDT) is an 8-bit timer that can generate an internal reset signal for this LSI
if a system crash prevents the CPU from writing to the timer counter, thus allowing it to overflow.
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.
The block diagram of the WDT is shown in figure 13.1.
13.1
• Selectable from 8 counter input clocks for WDT_0
• Switchable between watchdog timer mode and interval timer mode
In watchdog timer mode
• Choosable between power-on reset or manual reset as internal reset
• If the counter in WDT_0 overflows, it is possible to select whether this LSI is internally reset
• If the counter in WDT_1 overflows, it is possible to select whether this LSI is internally reset
In interval timer mode
• If the counter overflows, the WDT generates an interval timer interrupt (WOVI)
• The selected clock can be output from the BUZZ output pin (WDT_1)
Selectable from 16 counter input clocks for WDT_1
or not
or the internal NMI interrupt is generated
Features
Section 13 Watchdog Timer (WDT)
Rev. 6.00 Mar. 18, 2010 Page 465 of 982
Section 13 Watchdog Timer (WDT)
REJ09B0054-0600