R8A77850ANBGV Renesas Electronics America, R8A77850ANBGV Datasheet - Page 541
R8A77850ANBGV
Manufacturer Part Number
R8A77850ANBGV
Description
IC SUPERH MPU ROMLESS 436-BGA
Manufacturer
Renesas Electronics America
Series
SuperH® SH7780r
Datasheet
1.R8A77850AADBGV.pdf
(1694 pages)
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
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
R8A77850ANBGV
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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Bit
10
9, 8
7 to 3
2 to 0
Bit Name
ODT_
EARLY
T_ODT1
and
T_ODT0
⎯
⎯
Initial
Value
0
00
All 0
111
R/W
R/W
R/W
R
R/W
Description
ODT Assertion Period Setting
Sets the ODT assertion period. The number of cycles is
the number of DDR clock cycles.
This setting is valid only when ODTEN is set to 01. In
order to extend ODT by 1 cycle using the setting of
ODT_EARLY, after setting CL to 5 or higher, the RDWR
bits in the DBTR2 register must be set to the value
specified in the data sheet for the DDR2-SDRAM, plus
1.
For details on the note when the ODTEN bits are set to
01, refer to section 12.5.9, Important Information
Regarding ODT Control Signal Output to SDRAM.
0: Asserts the ODT pin to high for 3 cycles for one write
1: Asserts the ODT pin to high for 4 cycles for one write
ODT Resistance Value Setting
These bits set the resistance value of the ODT
resistance within DDRPAD turned on for DDR2-SDRAM
reading. They should be set to the same value as the
Rtt set in EMRS(1) of DDR2-SDRAM.
00: ODT disabled
01: 75 Ω
10: 150 Ω
11: Setting prohibited (If specified, correct operation
Reserved
These bits are always read as 0. The write value should
always be 0.
If a value other than 0 is written, correct operation
cannot be guaranteed.
Reserved
These bits should always be written to 111. If these bits
are written to the value other than 111, correct operation
cannot be guaranteed.
command.
command.
cannot be guaranteed.)
Rev.1.00 Jan. 10, 2008 Page 509 of 1658
12. DDR2-SDRAM Interface (DBSC2)
REJ09B0261-0100
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