R8A77850ADBGV#RD0Z Renesas Electronics America, R8A77850ADBGV#RD0Z Datasheet - Page 522

• Manufacturer Part Number: R8A77850ADBGV#RD0Z
• Description: IC SUPERH MPU ROMLESS 436-BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7780r

Specifications of R8A77850ADBGV#RD0Z

• 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: -40°C ~ 85°C
• Package / Case: 436-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

12. DDR2-SDRAM Interface (DBSC2)
Rev.1.00 Jan. 10, 2008 Page 490 of 1658
REJ09B0261-0100
Bit
14 to 8
7 to 3
Bit Name
TRFC0
⎯
TRFC6 to
Initial
Value
000 0101
All 0
R/W
R/W
R
Description
tRFC (REF-ACT/REF period) Setting Bits
These bits set the REF-ACT/REF minimum period
constraint These bits should be set according to the
DDR2-SDRAM specifications. The number of cycles is
the number of DDR clock cycles.
000 0000: Setting prohibit (If specified, correct operation
000 0100: Setting prohibit (If specified, correct operation
000 0101: 6 cycles
000 0110: 7 cycles
100 0001: 66 cycles
100 0010: Setting prohibit (If specified, correct operation
111 1111: Setting prohibit (If specified, correct operation
Reserved
These bits are always read as 0. The write value should
always be 0.
Operation when a value other than 0 is written is not
guaranteed.
:
:
:
cannot be guaranteed.)
cannot be guaranteed.)
cannot be guaranteed.)
cannot be guaranteed.)