R8A77850ANBGV Renesas Electronics America, R8A77850ANBGV Datasheet - Page 804

• Manufacturer Part Number: R8A77850ANBGV
• Description: IC SUPERH MPU ROMLESS 436-BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7780r

Specifications of R8A77850ANBGV

• Core Processor: SH-4A
• Core Size: 32-Bit
• Speed: 600MHz
• Connectivity: Audio Codec, MMC, Serial Sound, SCI, SIO, SPI, SSI
• Peripherals: DMA, POR, WDT
• Number Of I /o: 108
• Program Memory Type: ROMless
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 1 V ~ 1.2 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 436-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

16. Watchdog Timer and Reset (WDT)
16.4.4
The relationship between WDTCNT and WDTBCNT is shown in figure 16.2. The example shown
in the figure is the operation in interval timer mode, where WDTCNT restarts counting after it has
overflowed. In watchdog timer mode, WDTCNT and WDTBCNT are cleared to 0 after the reset
state is exited and start counting up again.
Rev.1.00 Jan. 10, 2008 Page 772 of 1658
REJ09B0261-0100
H'0003 FFFF
H'0000 0000
H'0000 0000
WDTST
WDTCNT value
WDTBCNT value
Figure 16.2 WDT Counting Operations (Example in Interval Timer Mode)
WOVF
Time until WDT Counters Overflow
IOVF
TME
Incremented every
peripheral clock (Pck)
cycle
Counting starts
Incremented on each
WDTBCNT overflow
Cleared to 0
on overflow
Flag is set
Cleared to 0
on overflow
Time
Time