HD64F7144F50V Renesas Electronics America, HD64F7144F50V Datasheet - Page 432

• Manufacturer Part Number: HD64F7144F50V
• Description: IC SUPERH MCU FLASH 256K 112QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7144r

Specifications of HD64F7144F50V

• 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 Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• 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: -

12. Watchdog Timer
12.4.2
To use the WDT as an interval timer, clear WT/IT to 0 and set TME to 1 in TCSR. An interval
timer interrupt (ITI) is generated each time the timer counter (TCNT) overflows. This function can
be used to generate interval timer interrupts at regular intervals.
Rev.4.00 Mar. 27, 2008 Page 386 of 882
REJ09B0108-0400
Interval Timer Mode
Internal reset
signal*
WDTOVF
signal
WT/IT: Timer mode select bit
TME:
Note: * Internal reset signal occurs only when the RSTE bit is set to 1.
H'00
ITI: Interval timer interrupt request generation
H'FF
TCNT value
H'FF
H'00
Timer enable bit
TCNT value
WT/IT = 0
TME = 1
Figure 12.2 Operation in Watchdog Timer Mode
WT/IT = 1
TME = 1
Figure 12.3 Operation in Interval Timer Mode
Overflow
H’00 written
in TCNT
ITI
Overflow
WDTOVF and internal
reset generated
ITI
Overflow
WOVF = 1
128 φ clocks
512 φ clocks
Overflow
ITI
WT/IT = 1
TME = 1
Overflow
H’00 written
in TCNT
ITI
Time
Time