R8A77850AADBGV Renesas Electronics America, R8A77850AADBGV Datasheet - Page 581
R8A77850AADBGV
Manufacturer Part Number
R8A77850AADBGV
Description
IC SUPERH MCU 436-BGA
Manufacturer
Renesas Electronics America
Series
SuperH® SH7780r
Datasheet
1.R8A77850AADBGV.pdf
(1694 pages)
Specifications of R8A77850AADBGV
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:
R8A77850AADBGV
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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5. The SDRAM configuration setting register (DBCONF), SDRAM timing register 0 (DBTR0),
6. By writing to the DDRPAD frequency setting register DBFREQ, DLL settings are made.
7. Write to the DDRPAD DIC, ODT, OCD setting register DBDICODTOCD. Values to be
8. Use the CMD bits in the SDRAM command control register (DBCMDCNT) to set the MCKE
9. Write to DBCMDCNT to issue a REF (auto-refresh) command.
10. Set the ACEN bit in the SDRAM operation enable register (DBEN) to 1 (access enabled).
11. Set the SDRAM refresh control registers 1 and 2 (DBRFCNT1 and DBRFCNT2).
12. Set the ARFEN bit in the SDRAM refresh control register 0 (DBRFCNT0) to 1 (automatic
12.5.11 Method for Securing Time Required for Initialization, Self-Refresh Cancellation,
When using DBSC2 register settings to set initialization, cancel self-refresh and the like, it is
necessary to wait a time stipulated by the SDRAM specifications. One example of this waiting is
the method used to read the DBSC2 status register (DBSTATE). Upon executing reading of the
DBSC2 status register (DBSTATE), a minimum of 8 cycles of the memory clock elapse. If
operation is at 300 MHz, then approximately 26 ns elapses in a single DBSTATE read operation.
This can be utilized to secure the required time, by repeating read access the necessary number of
times.
12.5.12 Regarding the Supported Clock Ratio
The only clock ratio supported by the DBSC2 is a ratio of 1:1 between the SuperHyway clock and
the DDR clock. Clock ratios other than 1:1 are not supported.
SDRAM timing register 1 (DBTR1), and SDRAM timing register 2 (DBTR2) should be set.
A. Set DLLRST = 0.
B. Set the FREQ bits to the DDRPAD frequency.
C. After setting DLLRST = 1, the software waits for the DLL stabilization time of 100 μs or
written should match values set in SDRAM EMRS(1).
signal to high level, and have the software wait for the time, requested by the respective
memory manufacturers, from cancellation of the self-refresh state until issue of a non-read
command (time tXSNR).
issue of auto-refresh enabled). Thereafter, normal access is possible.
more required by DDRPAD.
etc.
Rev.1.00 Jan. 10, 2008 Page 549 of 1658
12. DDR2-SDRAM Interface (DBSC2)
REJ09B0261-0100
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