R8A77850ADBGV Renesas Electronics America, R8A77850ADBGV Datasheet - Page 517
R8A77850ADBGV
Manufacturer Part Number
R8A77850ADBGV
Description
IC SUPERH MPU ROMLESS 436-BGA
Manufacturer
Renesas Electronics America
Series
SuperH® SH7780r
Datasheet
1.R8A77850AADBGV.pdf
(1694 pages)
Specifications of R8A77850ADBGV
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
-
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
R8A77850ADBGV
Manufacturer:
Renesas Electronics America
Quantity:
10 000
Company:
Part Number:
R8A77850ADBGV#RD0Z
Manufacturer:
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Quantity:
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Note: This register can be written only when automatic issue of auto-refresh is disabled (the
Bit
2 to 0
ARFEN bit in the DBRFCNT0 register is cleared to 0).
Bit Name
CMD2 to
CMD0
Initial
Value
000
R/W
R/W
Description
SDRAM Command Issue Bit
These bits are used to issue commands necessary to
execute the DDR2-SDRAM initialization sequence and
self-refresh transition/cancellation. When these bits are
written, the command corresponding to the written value
is issued once. For example, in order to issue the auto-
refresh command twice, it would be necessary to write
100 to these bits twice. The precharge interval,
minimum interval between auto-refresh and the next
command, and other intervals are values set in the
SDRAM timing register, described below. When read,
these bits are always read as 000.
Once writing is performed to enable the MCKE signal, it
remains enabled. During self-refresh control, the MCKE
goes to low level, but on cancellation MCKE
automatically returns to high level.
For details on the MCKE signal operation, refer to
section 12.5.13, Regarding MCKE Signal Operation.
000: Normal operation (power-on reset)
001: Setting prohibited (Correct operation cannot be
010: Precharge (PALL) command issued
011: The MCKE signal is enabled (high level).
100: Auto-refresh (REF) command issued
101 to 111: Setting prohibited (Correct operation cannot
guaranteed.)
be guaranteed.)
Rev.1.00 Jan. 10, 2008 Page 485 of 1658
12. DDR2-SDRAM Interface (DBSC2)
REJ09B0261-0100
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