Section 19 Multimedia Card Interface (MCIF)
Rev. 3.00 Jan 25, 2006 page 640 of 872
REJ09B0286-0300
19.3.8
Command Start Register (CMDSTRT)
CMDSTRT triggers the start of command transmission, representing the start of a command
sequence. The following operations should be completed before the command sequence starts.
•
Analysis of prior command response, clearing the command response register write if
necessary
•
Analysis/transfer of receive data of prior command if necessary
•
Preparation of transmission data of the next command if necessary
•
Setting of CMDTYR, RSPTYR, TBCR, and TBNCR
CMDTYR, RSPTYR, TBCR, and TBNCR should not be changed until the command sequence
has ended.
•
Setting of CMDR0 to CMDR4
CMDR0 to CMDR4 should not be changed until the command sequence has ended (the
CWRE flag in CSTR has been reset, or a command transmission end interrupt has been
generated).
The command sequences are controlled by the sequencers in each MCIF side and MMC side.
Normally, these operate synchronously, however, these may temporarily become unsynchronized
when an error occurs or when a command is aborted. Take care to set the CMDOFF bit in OPCR,
to issue the CMD12 command, and to process an error in MMC mode. A new command sequence
should be started after confirming that the command sequences on both the MCIF and MMC sides
have ended.
Bit
Bit Name
Initial Value
R/W
Description
7 to
1
—
All 0
R/(W)
Reserved
The initial value should not be changed.
0
START
0
R/W
Command Sequence Start Bit
Starts command transmission when 1 is written.
This bit is always read as 0.
[Clearing condition]
•
Automatically cleared when command
transmission starts
Summary of Contents for H8S/2158
Page 10: ...Rev 3 00 Jan 25 2006 page viii of lii...
Page 36: ...Rev 3 00 Jan 25 2006 page xxxiv of lii B Product Lineup 863 C Package Dimensions 864 Index 865...
Page 47: ...Rev 3 00 Jan 25 2006 page xlv of lii Appendix Figure C 1 Package Dimensions TBP 112A 864...
Page 54: ...Rev 3 00 Jan 25 2006 page lii of lii...
Page 70: ...Section 1 Overview Rev 3 00 Jan 25 2006 page 16 of 872 REJ09B0286 0300...
Page 118: ...Section 3 MCU Operating Modes Rev 3 00 Jan 25 2006 page 64 of 872 REJ09B0286 0300...
Page 126: ...Section 4 Exception Handling Rev 3 00 Jan 25 2006 page 72 of 872 REJ09B0286 0300...
Page 198: ...Section 6 Bus Controller Rev 3 00 Jan 25 2006 page 144 of 872 REJ09B0286 0300...
Page 326: ...Section 10 8 Bit PWM Timer PWM Rev 3 00 Jan 25 2006 page 272 of 872 REJ09B0286 0300...
Page 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Page 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
Page 742: ...Section 19 Multimedia Card Interface MCIF Rev 3 00 Jan 25 2006 page 688 of 872 REJ09B0286 0300...
Page 750: ...Section 21 D A Converter Rev 3 00 Jan 25 2006 page 696 of 872 REJ09B0286 0300...
Page 768: ...Section 22 A D Converter Rev 3 00 Jan 25 2006 page 714 of 872 REJ09B0286 0300...
Page 770: ...Section 23 RAM Rev 3 00 Jan 25 2006 page 716 of 872 REJ09B0286 0300...
Page 824: ...Section 26 Clock Pulse Generator Rev 3 00 Jan 25 2006 page 770 of 872 REJ09B0286 0300...
Page 844: ...Section 27 Power Down Modes Rev 3 00 Jan 25 2006 page 790 of 872 REJ09B0286 0300...
Page 878: ...Section 28 List of Registers Rev 3 00 Jan 25 2006 page 824 of 872 REJ09B0286 0300...
Page 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...