R8A77800ANBGAV Renesas Electronics America, R8A77800ANBGAV Datasheet - Page 493

• 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 12 DDR-SDRAM Interface (DDRIF)
12.7.5
Setting Auto-Refresh Interval
The auto-refresh interval is specified by the DRI bits in MIM. If the DRE bit is set to 1 at the same
time as the DRI bits are set, the time until the first auto-refresh is that selected by the value of the
DRI bits before the new setting was made. However, the second and subsequent auto-refresh
intervals take on the value corresponding to the new setting for the DRI bits. To avoid this
situation, clear the DRE bit to 0 whenever you change the settings of the DRI bits. When the DRE
bit is subsequently set to 1 and the same DRI setting is repeated, auto-refreshing proceeds with the
specified interval from the first round. In this case, take care to ensure that the DRI bits have the
same value.
Rev.1.00 Dec. 13, 2005 Page 441 of 1286
REJ09B0158-0100