R8A77850ADBGV Renesas Electronics America, R8A77850ADBGV Datasheet - Page 527
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
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
R8A77850ADBGV
Manufacturer:
Renesas Electronics America
Quantity:
10 000
Company:
Part Number:
R8A77850ADBGV#RD0Z
Manufacturer:
Renesas Electronics America
Quantity:
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12.4.7
The SDRAM timing register 2 (DBTR2) is a readable/writable register. It is initialized only upon
power-on reset.
Initial value:
Initial value:
Bit
31 to 26 ⎯
25, 24
23 to 21 ⎯
R/W:
R/W:
BIt:
BIt:
SDRAM Timing Register 2 (DBTR2)
Bit Name
TRTP1 and
TRTP0
31
15
⎯
⎯
R
R
0
0
30
14
⎯
⎯
R
R
0
0
29
13
⎯
⎯
Initial
Value
All 0
01
All 0
R
R
0
0
28
12
⎯
⎯
R
R
0
0
RDWR3
R/W
27
⎯
11
R
0
0
R/W
R
R/W
R
RDWR2
R/W
26
10
⎯
R
0
0
Description
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.
These bits set the READ-PRE command minimum time
constraint for the same bank. These bits should be set
according to the SDRAM specifications. The number of
cycles is the number of DDR clock cycles.
00: Setting prohibit (If specified, correct operation
01: 2 cycles
10: 3 cycles
11: 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.
tRTP (READ-PRE command minimum time) Setting Bits
TRTP1
RDWR1
R/W
R/W
25
0
9
1
cannot be guaranteed.)
cannot be guaranteed.)
TRTP0
RDWR0
R/W
R/W
24
1
8
1
23
⎯
⎯
R
R
0
7
0
Rev.1.00 Jan. 10, 2008 Page 495 of 1658
22
⎯
⎯
R
R
0
6
0
12. DDR2-SDRAM Interface (DBSC2)
21
⎯
⎯
R
R
0
5
0
TRC4
R/W
20
⎯
R
0
4
0
WRRD3
TRC3
R/W
R/W
19
0
3
0
REJ09B0261-0100
WRRD2
TRC2
R/W
R/W
18
1
2
0
WRRD1
TRC1
R/W
R/W
17
0
1
1
WRRD0
TRC0
R/W
R/W
16
0
0
1
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