Section 18 Serial Sound Interface (SSI)
Rev. 0.50 May 18, 2006 Page 862 of 1588
REJ09B0313-0050
Bit Bit
Name
Initial
Value
R/W Description
1
SWNO
1
R
System Word Number
This status bit indicates the current word number.
•
TRMD = 0 (Receive mode)
SWNO indicates which system word the data in
SSIRDR currently represents. This value will
change as the data in SSIRDR is updated from the
shift register, regardless of whether SSIRDR has
been read.
•
TRMD = 1 (Transmit mode)
SWNO indicates which system word is required to
be written to SSITDR. This value will change as the
data is copied to the shift register, regardless of
whether the data is written to SSITDR.
0
IDST
1
R
Idle Mode Status Flag
This status flag indicates that the serial bus activity has
stopped.
This bit is cleared if EN = 1 and the serial bus are
currently active.
This bit is automatically set to 1 under the following
conditions.
•
SSI = Master transmitter (SWSD = 1 and
TRMD = 1)
This bit is set to 1 if all the data in the system word
to be transmitted has been written to SSITDR and if
the EN bit is cleared to end the system word
currently being output.
•
SSI = Master receiver (SWSD = 1 and TRMD = 0)
This bit is set to 1 if the EN bit is cleared and the
current system word is completed.
•
SSI = Slave transmitter/receiver (SWSD = 0)
This bit is set to 1 if the EN bit is cleared and the
current system word is completed.
Note: If the external master stops the serial bus clock
before the current system word is completed,
this bit is not set.
Note:
*
The bit can be read or written to. Writing 0 initializes the bit, but writing 1 is ignored.
Содержание Single-Chip Microcomputer SH7203
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Страница 668: ...Section 11 Multi Function Timer Pulse Unit 2 MTU2 Rev 0 50 May 18 2006 Page 638 of 1588 REJ09B0313 0050 ...
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Страница 726: ...Section 14 Realtime Clock RTC Rev 0 50 May 18 2006 Page 696 of 1588 REJ09B0313 0050 ...
Страница 796: ...Section 15 Serial Communication Interface with FIFO SCIF Rev 0 50 May 18 2006 Page 766 of 1588 REJ09B0313 0050 ...
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Страница 1512: ...Section 30 List of Registers Rev 0 50 May 18 2006 Page 1482 of 1588 REJ09B0313 0050 ...
Страница 1598: ...Section 31 Electrical Characteristics Rev 0 50 May 18 2006 Page 1568 of 1588 REJ09B0313 0050 ...
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