R8A77850ANBGV Renesas Electronics America, R8A77850ANBGV Datasheet - Page 533

• 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: -

Note: Writing to this register should be performed only when the following condition is met.
Bit
12 to 0
•
Bit Name
TREFI12 to
TREFI0
When automatic issue of auto-refresh is disabled (when the ARFEN bit in the
DBRFCNT0 register is cleared to 0.).
Initial
Value
0 0010
0000 0000
R/W
R/W
Description
Average Refresh Interval Setting Bits
These bits set the average interval for auto-refresh
operation. Upon refresh execution, this value is added
to the refresh interval count register.
The number of cycles is the number of DDR clock
cycles.
0 0000 0000 0000: Setting prohibited (If specified,
0 0000 0011 1111: Setting prohibited (If specified,
0 0000 0100 0000: 65 cycles
0 0000 0100 0001: 66 cycles
1 1111 1111 1111: 8192 cycles
:
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Rev.1.00 Jan. 10, 2008 Page 501 of 1658
correct operation cannot be
guaranteed.)
correct operation cannot be
guaranteed.)
12. DDR2-SDRAM Interface (DBSC2)
REJ09B0261-0100