DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 480

• Manufacturer Part Number: DF2437FV
• Description: IC H8S/2437 MCU FLASH 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2400r

Specifications of DF2437FV

• Core Processor: H8S/2600
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 85
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 128-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

15.3.2
When the WDT is used as an interval timer, an interval timer interrupt (WOVI) is generated each
time TCNT overflows, as shown in figure 15.3. Therefore, an interrupt can be generated at
intervals.
When TCNT overflows in interval timer mode, the OVF bit in TCSR is set to 1 and at the same
time an interval timer interrupt (WOVI) is requested. The timing is shown in figure 15.4.
Rev.2.00 May. 28, 2009 Page 440 of 732
REJ09B0059-0200
[Legend]
WOVI : Interval timer interrupt request occurrence
H'FF
H'00
Interval Timer Mode
TCNT value
WT/
TME = 1
φ
TCNT
Overflow signal
(internal signal)
OVF
= 0
Figure 15.3 Interval Timer Mode Operation
Overflow
WOVI
Figure 15.4 OVF Flag Set Timing
H'FF
Overflow
WOVI
Overflow
WOVI
H'00
Overflow
WOVI
Time