DF2238RTF6 Renesas Electronics America, DF2238RTF6 Datasheet - Page 538

• 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)
13.4.4
With WDT_0 the WOVF bit in RSTCSR is set to 1 if TCNT overflows in watchdog timer mode.
If TCNT overflows while the RSTE bit in RSTCSR is set to 1, an internal is generated for the
entire chip. (The WOVI interrupt is not generated.) This timing is illustrated in figure 13.5.
13.5
During interval timer mode operation, an overflow generates an interval timer interrupt (WOVI).
The interval timer interrupt is requested whenever the OVF flag is set to 1 in TCSR. OVF must be
cleared to 0 in the interrupt handling routine.
If an NMI interrupt request has been chosen in the watchdog timer mode, an NMI interrupt request
is generated when a TCNT overflow occurs.
Table 13.2 WDT Interrupt Source
Rev. 6.00 Mar. 18, 2010 Page 476 of 982
REJ09B0054-0600
Name
WOVI
NMI
TCNT
Overflow signal
(internal signal)
WOVF
Internal reset
signal
φ
Timing of Setting Watchdog Timer Overflow Flag (WOVF)
Interrupt Sources
Interrupt Source
TCNT overflow (interval timer mode)
TCNT overflow (watchdog timer mode)
Figure 13.5 Timing of WOVF Setting
H'FF
H'00
515/516 states (WDT_1)
518 states (WDT_0)
Interrupt Flag
OVF
OVF