Renesas SH7781 用户手册

24.   Multimedia Card Interface (MMCIF) 

Rev.1.00  Jan. 10, 2008  Page 1196 of 1658 
REJ09B0261-0100 

 

MODER is an 8-bit readable/writable register that specifies the MMCIF operating mode. The 
following sequence should be repeated when the MMCIF uses the multimedia card: Send a 
command, wait for the end of the command sequence and the end of the data busy state, and send 
a next command. 

The series of operations from command sending, command response reception, data 
transmission/reception, and data response reception is called as the command sequence. The 
command sequence starts from sending a command by setting the CMDSTART bit in CMDSTRT 
to 1, and ends when all necessary data transmission/reception and response reception have been 
completed. The multimedia card supports the data busy state such that only the specific command 
is accepted to write/erase data to/from the flash memory in the card during command sequence 
execution and after command sequence execution has ended. The data busy state is indicated by a 
low level output from the card side to the MMCDAT pin. 

Bit:

 

Initial value:

R/W:

7

6

5

4

3

2

1

0

0

0

0

0

0

0

0

0

R

MODE

R

R

R

R

R

R

R/W

⎯

⎯

⎯

⎯

⎯

⎯

⎯

 

 

7 to 1 

— 

All 0 

R 

Reserved 

These bits are always read as 0. The write value should 
always be 0. 

0 MODE 

0 R/W 

Operating 

Mode 

Specifies the MMCIF operating mode. 

0: Operates in MMC mode 

1: Setting prohibited