R8A77800ANBGAV Renesas Electronics America, R8A77800ANBGAV Datasheet - Page 677

• 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: -

The reset and watchdog timer (WDT) control circuit comprises the reset control unit and WDT
control unit which control the power-on reset sequence and a reset for on-chip peripheral modules
and external devices.
The WDT is a one-channel timer which can be used as the watchdog timer or interval timer.
16.1
• The watchdog timer unit monitors a system crash using a timer counting at specified intervals.
• The watchdog timer unit generates a reset for on-chip peripheral modules when a WDT
• A power-on reset or a manual reset can be selectable, when a manual reset is selected, the
• Generates the interval timer interrupt when counter overflow occurs in interval timer mode.
• The maximum time until the watchdog timer overflows is approximately 21 seconds (when the
• Writing to WDT-related registers is not normally allowed. A specified code in the upper bits of
overflow occurs.
MRESETOUT pin is asserted.
peripheral clock Pck is 50 MHz).
write data enables writing to the registers.
WTCNT and WTCSR differ from other registers in being more difficult to write to. The
procedure for writing to these registers is given below.
Features
Section 16 Watchdog Timer and Reset
Rev.1.00 Dec. 13, 2005 Page 625 of 1286
Section 16 Watchdog Timer and Reset
REJ09B0158-0100