h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 697

• Manufacturer Part Number: h8s-2158
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

19.3.12 Card Status Register (CSTR)
CSTR indicates the MCIF status during command sequence execution.
Bit
7
6
5
4
Bit Name
BUSY
FIFO_FULL
FIFO_EMPTY 0
CWRE
Initial Value
0
0
0
R/W
R
R
R
R
Description
Command Busy
Indicates command execution status. When the
CMDOFF bit in OPCR is set to 1, this bit is
cleared to 0 because the MCIF command
sequence is aborted.
0: Command sequence has ended.
1: Command sequence execution in progress.
FIFO Full
Indicates whether receive data FIFO full has
been detected.
0: Receive data FIFO full is not detected.
1: Receive data FIFO full is detected.
After FIFO full detection, this bit is cleared to 0
when resuming to receive read data from the
MMC or when the command sequence ends.
FIFO Empty
Indicates whether transmit data FIFO empty has
been detected.
0: Transmit data FIFO empty is not detected.
1: Transmit data FIFO empty is detected.
After FIFO empty detection, this bit is cleared to
0 when resuming to transmit data to the MMC or
when the command sequence ends.
Command Register Write Enable
Indicates whether the CMDR command is being
transmitted or has been transmitted.
0: The CMDR command has been transmitted,
1: The CMDR command is waiting for
Section 19 Multimedia Card Interface (MCIF)
or the START bit in CMDSTRT has not been
set yet, so the new command can be written.
transmission or is being transmitted. If the
new command is written, a malfunction will
result.
Rev. 3.00 Jan 25, 2006 page 645 of 872
REJ09B0286-0300