Section 19 Multimedia Card Interface (MCIF)
Rev. 3.00 Jan 25, 2006 page 656 of 872
REJ09B0286-0300
19.5
Operations in MMC Mode
MMC mode is an operating mode in which the transfer clock is output from the MCCLK pin,
command transmission/response receive occurs via the MCCMD pin, and data is
transmitted/received via the MCDAT pin. In this mode the next command can be issued while data
is being transmitted/received. This feature can be applied to the multiblock transfer and stream
transfer in which the number of bytes for data transfer does not need to be specified beforehand. In
this case, the next command is the CMD12 command, which aborts the current command
sequence.
In MMC mode, a broadcast command that simultaneously issues a command to multiple MMCs is
supported. After the information for the MMC that is inserted by using the broadcast command is
acknowledged, a relative address is given to each MMC. One MMC is selected by the relative
address, other MMCs are deselected, and various commands are issued to the selected MMC.
19.5.1
Operation of Broadcast Commands
The CMD0, CMD1, CMD2M, and CMD4M are broadcast commands. The command sequence
assigning relative addresses to individual MMCs consists of these commands and the CMD3M
command. In this command sequence, the CMD output format of the MMC side is open drain, and
the command response is wired-OR. During the issuance of this command sequence, the transfer
clock frequency should be set sufficiently slow. Operation of a typical command is summarized
below.
•
All MMCs are initialized to the idle state by CMD0.
•
The operation condition register (OCR) of all MMCs is read by CMD1 via wired-OR, and
MMCs that cannot operate are deactivated. The deactivated MMCs enter the ready state.
•
The card identification (CID) of all MMCs in the ready state is read by CMD2M via wired-
OR. The individual MMC compares its CID and data on the CMD, and if different, aborts CID
output. A single MMC in which the CID can be entirely output enters the acknowledge state.
•
A relative address (RCA) is given to the MMC in the acknowledge state by the CMD3M.
The MMC to which the RCA is given enters the standby state.
•
CMD2M and CMD3M are repeated, assigning RCAs to all MMCs in the ready state, entering
each into the standby state.
Содержание H8S/2158
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Страница 36: ...Rev 3 00 Jan 25 2006 page xxxiv of lii B Product Lineup 863 C Package Dimensions 864 Index 865...
Страница 47: ...Rev 3 00 Jan 25 2006 page xlv of lii Appendix Figure C 1 Package Dimensions TBP 112A 864...
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Страница 70: ...Section 1 Overview Rev 3 00 Jan 25 2006 page 16 of 872 REJ09B0286 0300...
Страница 118: ...Section 3 MCU Operating Modes Rev 3 00 Jan 25 2006 page 64 of 872 REJ09B0286 0300...
Страница 126: ...Section 4 Exception Handling Rev 3 00 Jan 25 2006 page 72 of 872 REJ09B0286 0300...
Страница 198: ...Section 6 Bus Controller Rev 3 00 Jan 25 2006 page 144 of 872 REJ09B0286 0300...
Страница 326: ...Section 10 8 Bit PWM Timer PWM Rev 3 00 Jan 25 2006 page 272 of 872 REJ09B0286 0300...
Страница 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Страница 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
Страница 742: ...Section 19 Multimedia Card Interface MCIF Rev 3 00 Jan 25 2006 page 688 of 872 REJ09B0286 0300...
Страница 744: ...Section 20 Encryption Operation Circuit DES and GF Rev 3 00 Jan 25 2006 page 690 of 872 REJ09B0286 0300...
Страница 750: ...Section 21 D A Converter Rev 3 00 Jan 25 2006 page 696 of 872 REJ09B0286 0300...
Страница 768: ...Section 22 A D Converter Rev 3 00 Jan 25 2006 page 714 of 872 REJ09B0286 0300...
Страница 770: ...Section 23 RAM Rev 3 00 Jan 25 2006 page 716 of 872 REJ09B0286 0300...
Страница 824: ...Section 26 Clock Pulse Generator Rev 3 00 Jan 25 2006 page 770 of 872 REJ09B0286 0300...
Страница 844: ...Section 27 Power Down Modes Rev 3 00 Jan 25 2006 page 790 of 872 REJ09B0286 0300...
Страница 878: ...Section 28 List of Registers Rev 3 00 Jan 25 2006 page 824 of 872 REJ09B0286 0300...
Страница 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...