R8A77850ADBGV Renesas Electronics America, R8A77850ADBGV Datasheet - Page 1238

• Manufacturer Part Number: R8A77850ADBGV
• Description: IC SUPERH MPU ROMLESS 436-BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7780r

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: -

24. Multimedia Card Interface (MMCIF)
24.3.16 Data Register (DR)
DR is a register for reading/writing FIFO data.
Word/byte access is enabled to addresses of this register.
The following shows examples of DR access.
When data is written to DR in the following steps 1 to 4, the transmit data is stored in the FIFO as
shown in figure 24.2.
1. Write word data H'0123 to DR.
2. Write byte data H'45 to DR.
3. Write word data H'6789 to DR.
4. Write byte data H'AB to DR.
When the receive data is stored in the FIFO as shown in figure 24.2 (for example, after data is
started to be received while the FIFO is empty and data is received in the order of H'01, H'23, ...,
H'AB), data can be read from DR in the following steps 5 to 8.
5. Read byte data H'01 from DR.
6. Read word data H'2345 from DR.
7. Read byte data H'67 from DR.
8. Read word data H'89AB from DR.
Rev.1.00 Jan. 10, 2008 Page 1206 of 1658
REJ09B0261-0100
Initial value:
Bit
15 to 0
R/W:
Bit:
Bit Name
DR
R/W
15
—
R/W
14
—
R/W
13
—
Initial
Value
⎯
R/W
12
—
R/W
11
—
R/W
R/W
R/W
10
—
Description
Register for reading/writing FIFO data.
Word/byte access is enabled.
When DR is accessed in words, the upper and lower
bytes are transmitted or received in that order. Word
access and byte access can be done in random order.
However, (DR address + 1) cannot be accessed in
bytes.
R/W
—
9
R/W
—
8
DR
R/W
—
7
R/W
—
6
R/W
—
5
R/W
—
4
R/W R/W
3
—
—
2
R/W
—
1
R/W
—
0