r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 536

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

12. DDR2-SDRAM Interface (DBSC2)
Note: This register is used for initialization, when canceling self-refresh, and when canceling
Rev.1.00 Jan. 10, 2008 Page 506 of 1658
REJ09B0261-0100
Bit
2 to 0
power supply backup.
For details, refer to section 12.5.3, Initialization Sequence, section 12.5.4, Self-Refresh
Operation, and (2) Recovery from SDRAM Power Supply Backup Mode in section 12.5.10,
DDR2-SDRAM Power Supply Backup Function.
Bit Name
FREQ0
FREQ2 to
Initial
Value
000
R/W
R/W
Description
Frequency Setting Bits
These bits set the operating frequency of the data bus
in the DDR2-SDRAM.
000: up to 300 MHz (DDR2-600)
001: Reserved
010: 200 MHz (DDR2-400)
100 to 111: Setting prohibited. (If specified, correct
operation cannot be guaranteed.)