DF2238RTF6 Renesas Electronics America, DF2238RTF6 Datasheet - Page 536

• 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

Section 13 Watchdog Timer (WDT)
13.4.2
To use the WDT as a watchdog timer, set the WT/IT and TME bits in TCSR to 1.
When the WDT is used as an interval timer, an interval timer interrupt (WOVI) is generated each
time the TCNT overflows. (The NMI interrupt is not generated.) Therefore, an interrupt can be
generated at intervals.
Rev. 6.00 Mar. 18, 2010 Page 474 of 982
REJ09B0054-0600
Interval Timer Mode
Legend:
WT/IT:
TME:
WOVF:
Note: * In the case of WDT_0, the internal reset signal is generated only when the RSTE bit is set to 1.
Internal reset signal *
Timer mode select bit
Timer enable bit
Overflow flag
In the case of WDT_1,either the internal reset or the NMI interrupt is generated.
H'FF
H'00
TCNT value
Figure 13.2 Watchdog Timer Mode Operation
WT/IT=1
TME=1
Write H'00'
to TCNT
internal reset is
generated
Overflow
WOVF=1
518 system clock (WDT0)
515/516 system clock (WDT1)
WT/IT=1
TME=1
Write H'00'
to TCNT
Time