r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 1242
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r8a77850anbg
Manufacturer Part Number
r8a77850anbg
Description
Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R8A77850ANBG.pdf
(1692 pages)
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Part Number:
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24. Multimedia Card Interface (MMCIF)
(4)
Broadcast, relative address, and flash memory operation commands include a number of
commands that do not include data transfer. Such commands execute the desired data transfer
using command arguments and command responses. For a command that is related to time-
consuming processing such as flash memory write/erase, the card indicates the data busy state via
the MMCDAT.
Figures 24.5 and 24.6 show examples of the command sequence for commands without data
transfer.
Figure 24.7 shows the operational flow for commands without data transfer.
• Make settings to issue the command.
• Set the CMDSTART bit in CMDSTRT to 1 to start command transmission.
Rev.1.00 Jan. 10, 2008 Page 1212 of 1658
REJ09B0261-0100
Command transmission completion can be confirmed by the command transmit end interrupt
(CMDI).
Operation of Commands without Data Transfer
Figure 24.4 Example of Operational Flow for Commands
Set command data in CMDR0 to CMDR4
Set the CMDSTART bit in CMDSTRT to 1
Set command response type in RSPTYR
Not Requiring Command Response
Set command type in CMDTYR
Start of command sequence
End of command sequence
(CMDI) interrupt detected?
Yes
No
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