HD6417144F50V Renesas Electronics America, HD6417144F50V Datasheet - Page 437

• Manufacturer Part Number: HD6417144F50V
• Description: IC SUPERH MCU ROMLESS 112QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7144r

Specifications of HD6417144F50V

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: EBI/EMI, I²C, SCI
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 74
• Program Memory Type: ROMless
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 112-QFP
• For Use With: HS0005KCU11H - EMULATOR E10A-USB H8S(X),SH2(A)EDK7145 - DEV EVALUATION KIT SH7145
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

12.6.3
If the values of bits CKS2 to CKS0 in the timer control/status register (TCSR) are rewritten while
the WDT is running, the count may not increment correctly. Always stop the watchdog timer (by
clearing the TME bit to 0) before changing the values of bits CKS2 to CKS0.
12.6.4
To prevent incorrect operation, always stop the watchdog timer (by clearing the TME bit to 0)
before switching between interval timer mode and watchdog timer mode.
12.6.5
If a WDTOVF output signal is input to the RES pin, the chip cannot initialize correctly.
Avoid inputting the WDTOVF signal to the RES pin directly. To reset the entire system with the
WDTOVF signal, use the circuit shown in figure 12.9.
12.6.6
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.
Changing CKS2 to CKS0 Bit Values
Changing between Watchdog Timer and Interval Timer Modes
System Reset by WDTOVF Signal
Internal Reset in Watchdog Timer Mode
Figure 12.9 Example of System Reset Circuit Using WDTOVF Signal
Reset signal to entire system
Reset input
Rev.4.00 Mar. 27, 2008 Page 391 of 882
RES
WDTOVF
This LSI
12. Watchdog Timer
REJ09B0108-0400