HD64F7047F50 Renesas Electronics America, HD64F7047F50 Datasheet - Page 370

• Manufacturer Part Number: HD64F7047F50
• Description: IC SUPERH MCU FLASH 256K 100QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7047r

Specifications of HD64F7047F50

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: CAN, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 12K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

11.6.5
If a WDTOVF output signal is input to the RES pin, the chip cannot initialize correctly.
Avoid logical input of the WDTOVF signal to the RES input pin. To reset the entire system with
the WDTOVF signal, use the circuit shown in figure 11.9.
11.6.6
If the RSTE bit is cleared to 0 in watchdog timer mode, the chip will not be reset internally when a
TCNT overflow occurs, but TCNT and TCSR in the WDT will be reset.
11.6.7
When an internal reset is effected by TCNT overflow in watchdog timer mode, the processor waits
until the end of the bus cycle at the time of manual reset generation before making the transition to
manual reset exception processing. Therefore, the bus cycle is retained in a manual reset, but if a
manual reset occurs while the bus is released, manual reset exception processing will be deferred
until the CPU acquires the bus. However, if the interval from generation of the manual reset until
the end of the bus cycle is equal to or longer than the internal manual reset interval of 512 cycles,
the internal manual reset source is ignored instead of being deferred, and manual reset exception
processing is not executed.
11.6.8
Do not pull-down the WDTOVF pin. If this pin need to be pulled-down, the pull-down resistance
value must be 1 MΩ or higher.
Rev. 2.00, 09/04, page 328 of 720
Reset signal to entire system
System Reset by WDTOVF Signal
Internal Reset in Watchdog Timer Mode
Manual Reset in Watchdog Timer Mode
Handling of WDTOVF pin
Figure 11.9 Example of System Reset Circuit Using WDTOVF Signal
Reset input
RES
WDTOVF
This LSI