Section 24 Multimedia Card Interface (MMCIF)
Rev.1.00 Dec. 13, 2005 Page 885 of 1286
REJ09B0158-0100
24.3.7
Transfer Clock Control Register (CLKON)
CLKON controls the transfer clock frequency and clock ON/OFF.
At this time, use a sufficiently slow clock for transfer through open-drain type output in MMC
mode.
In a command sequence, do not perform clock ON/OFF or frequency modification.
Bit:
Initial value:
R/W:
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
R/W
CLKON
CSEL2 CSEL1 CSEL0
R
R
R
R/W
R/W
R/W
R/W
CSEL3
Bit Bit
Name
Initial
Value R/W Description
7 CLKON
0 R/W
Clock
On
0: Fixes the transfer clock output from the MCCLK pin
to low level.
1: Outputs the transfer clock from the MCCLK pin.
6 to 4
—
All 0
R
Reserved
These bits are always read as 0. The write value
should always be 0.
3
2
1
0
CSEL3
CSEL2
CSEL1
CSEL0
0
0
0
0
R/W
R/W
R/W
R/W
Transfer Clock Frequency Select
0000: Reserved
0001: Uses the 1/2-divided peripheral clock as a transfer clock.
0010: Uses the 1/4-divided peripheral clock as a transfer clock.
0011: Uses the 1/8-divided peripheral clock as a transfer clock.
0100: Uses the 1/16-divided peripheral clock as a transfer clock.
0101: Uses the 1/32-divided peripheral clock as a transfer clock.
0110: Uses the 1/64-divided peripheral clock as a transfer clock.
0111: Uses the 1/128-divided peripheral clock as a transfer clock.
1000: Uses the 1/256-divided peripheral clock as a transfer clock.
1001 to 1111: Setting prohibited
Note: To output transfer clock, it is necessary to set the
CLKON bit to 1, and set the CSEL[3:0] bits other
than 0000 and 1001 to 1111.
Summary of Contents for SH7780 Series
Page 2: ...Rev 1 00 Dec 13 2005 Page ii of l ...
Page 28: ...Rev 1 00 Dec 13 2005 Page xxviii of l ...
Page 50: ...Rev 1 00 Dec 13 2005 Page l of l ...
Page 82: ...Section 1 Overview Rev 1 00 Dec 13 2005 Page 32 of 1286 REJ09B0158 0100 ...
Page 122: ...Section 3 Instruction Set Rev 1 00 Dec 13 2005 Page 72 of 1286 REJ09B0158 0100 ...
Page 146: ...Section 4 Pipelining Rev 1 00 Dec 13 2005 Page 96 of 1286 REJ09B0158 0100 ...
Page 196: ...Section 6 Floating Point Unit FPU Rev 1 00 Dec 13 2005 Page 146 of 1286 REJ09B0158 0100 ...
Page 292: ...Section 9 L Memory Rev 1 00 Dec 13 2005 Page 242 of 1286 REJ09B0158 0100 ...
Page 492: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Dec 13 2005 Page 442 of 1286 REJ09B0158 0100 ...
Page 674: ...Section 15 Clock Pulse Generator CPG Rev 1 00 Dec 13 2005 Page 624 of 1286 REJ09B0158 0100 ...
Page 692: ...Section 16 Watchdog Timer and Reset Rev 1 00 Dec 13 2005 Page 642 of 1286 REJ09B0158 0100 ...
Page 726: ...Section 18 Timer Unit TMU Rev 1 00 Dec 13 2005 Page 676 of 1286 REJ09B0158 0100 ...
Page 1032: ...Section 25 Audio Codec Interface HAC Rev 1 00 Dec 13 2005 Page 982 of 1286 REJ09B0158 0100 ...
Page 1150: ...Section 28 General Purpose I O GPIO Rev 1 00 Dec 13 2005 Page 1100 of 1286 REJ09B0158 0100 ...
Page 1184: ...Section 29 User Break Controller UBC Rev 1 00 Dec 13 2005 Page 1134 of 1286 REJ09B0158 0100 ...
Page 1266: ...Section 31 Electrical Characteristics Rev 1 00 Dec 13 2005 Page 1216 of 1286 REJ09B0158 0100 ...
Page 1328: ...Appendix Rev 1 00 Dec 13 2005 Page 1278 of 1286 REJ09B0158 0100 ...
Page 1336: ...Rev 1 00 Dec 13 2005 Page 1286 of 1286 REJ09B0158 0100 ...
Page 1339: ......
Page 1340: ...SH7780 Hardware Manual ...