SH7760 Datasheet, PDF (991/1345 Pages) Renesas Technology Corp – SuperHTM RISC engine

26.3.18 Receive Data Timing Select Register (RDTIMSEL)
RDTIMSEL selects the acquisition timing of receive response or receive data from the card.
Consider the timing according to the multimedia card standards to set this register.
Bit: 7
6
5
-
-
-
Initial value: 0
0
0
R/W: R
R
R
4
3
-
-
0
0
RR
2
1
0
-
- _RTSEL
0
0
0
R R R/W
Bit
7 to 1
Bit
Name

0
RTSEL
Initial R/W Description
Value
All 0 R
Reserved
These bits are always read as 0. The write value should
always be 0.
0
R/W Receive Data Timing Selection
0: Receives data at the falling of MCCLK
1: Receives data at the rising of MCCLK
26.4 Operation
The multimedia card is an external storage media that can be easily connected or disconnected.
The MMCIF operates in MMC mode.
Insert a card and supply power to it. Then operate the MMCIF by applying the transfer clock after
setting an appropriate transfer clock frequency.
Do not connect or disconnect the card during command sequence execution or in the data busy
state.
26.4.1 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 is efficient for multiblock or stream transfer. In this case, the next command is the
CMD12 command, which aborts the current command sequence.
Rev. 1.0, 02/03, page 941 of 1294