R8A77800ANBGAV Renesas Electronics America, R8A77800ANBGAV Datasheet - Page 686

• Manufacturer Part Number: R8A77800ANBGAV
• Description: IC SUPERH MPU ROMLESS 449-BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7780r

Specifications of R8A77800ANBGAV

• Core Processor: SH-4A
• Core Size: 32-Bit
• Speed: 400MHz
• Connectivity: Audio Codec, MMC, Serial Sound, SCI, SIO, SPI, SSI
• Peripherals: DMA, POR, WDT
• Number Of I /o: 75
• Program Memory Type: ROMless
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.15 V ~ 1.35 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 449-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

Section 16 Watchdog Timer and Reset
16.4.2
1. Set the WDTCNT overflow interval value in WDTST.
2. Set the WT/IT bit in WDTCSR to 1, select the type of reset with the RSTS bit.
3. When the TME bit in WTCSR is set to 1, the WDT count starts.
4. During operation in watchdog timer mode, clear to the WDTCNT or WDTBCNT periodically
5. When the WDTCNT overflows, the WDT sets the WOVF flag in WDTCSR to 1, and
16.4.3
When the WDT is operating in interval timer mode, an interval timer interrupt is generated each
time the counter overflows. This enables interrupts to be generated at fixed intervals.
1. Set the WDTCNT overflow time in WDTST.
2. Clear the WT/IT bit in WDTCSR to 0.
3. When the TME bit in WDTCSR is set to 1, the WDT count starts.
4. When the WDTCNT overflows, the WDT sets the IOVF flag in WDTCSR to 1, and sends an
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REJ09B0158-0100
so that WDTCNT does not overflow. See section 16.4.5, Clearing WDT Counter for WDT
counter clear method.
generates a reset of the type specified by the RSTS bit. After reset operation, the WDTCNT
and WDTBCNT continues counting again.
interval timer interrupt (ITI) request to INTC. The counter continues counting.
Manual_reset()
{
}
Using watchdog timer mode
Using Interval timer mode
EXPEVT = H'0000 0020;
VBR = H'0000 0000;
SR.MD = 1;
SR.RB = 1;
SR.BL = 1;
SR.(I0-I3) = B'1111;
SR.FD = 0;
Initialize_CPU();
Initialize_Module(Manual);
PC = H'A000 0000;