Section 8 RAM-FIFO Unit (RFU)
Rev. 3.00 Jan 25, 2006 page 201 of 872
REJ09B0286-0300
When the RFU is emptied during data transmission, the transmission resume trigger (the
DATAEN bit in OPCR is set) is set once the RFU empty is cancelled (after the necessary data is
written), and data transmission is resumed.
When data reception is started, data is automatically written to the RFU. When the RFU is filled
during data reception, the reception resume trigger (the RD_CONTI bit in OPCR is set) is set once
the RFU full is cancelled (after the necessary data is read from the RFU), and data reception is
resumed.
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
Hardware (MCIF, RFU)
Firmware (CPU)
Command transmission
(data transmission to multimedia card)
Command transmission
(data transmission to multimedia card)
Data transmission end
Data transmission
resumption instruction
(Transmission resumption)
(Data transmission start)
Data transmission
start instruction
FIFO empty cancellation
waiting fo card clock stop
(transmission halted)
Empty cancellation
1-byte data transmission
to multimedia card
1-byte data read from RFU
Data transmission
start instruction?
Previous data
read sequence
Card clock stop
(reception halted)
All data transmission
ended?
FIFO empty
FIFO empty
Data
transmission command
sequence ended?
Command sequence end
Data read from
RFU ended?
FIFO empty cancellation
(data write to RFU)
Figure 8.11 Operation Flow of MCIF Transmission
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...