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15. Synchronous Serial Interface (SIO2)
15.3 Function
T
5CL8
(2) During the transmit/receive operation
When data is written to SIO2TDB, SIO2SR<TXF> is cleared to “0” and when a data is read from
SIO2RDB, SIO2SR<RXF> is cleared to “0”.
In internal clock operation, in case of the condition described below, the serial clock stops to “H”
level by an automatic-wait function when all of the bit set in the data has been transmitted.
• Next transmit data is not written to SIO2TDB after reading a received data from SIO2RDB.
• Received data is not read from SIO2RDB after writing a next transmit data to SIO2TDB.
• Neither SIO2TDB nor SIO2RDB is accessed after transmission.
The automatic wait function is released by writing the next transmit data to SIO2TDB after reading
the received data from SIO2RDB, or reading the received data from SIO2RDB after writing the next
data to SIO2TDB.
Then, transmit/receive operation is restarted after maximum 1 cycle of serial clock.
In external clock operation, reading the received data from SIO2RDB and writing the next data to
SIO2TDB must be finished before the shift operation of the next data begins.
If the transmit data is not written to SIO2TDB after SIO2SR<TXF> is set to “1”, transmit error
occurs immediately after shift operation is started. When the transmit error occurred,
SIO2SR<TXERR> is set to “1”.
If received data is not read out from SIO2RDB before next shift operation starts after setting
SIO2SR<RXF> to “1”, receive error occurs immediately after shift operation is finished. When the
receive error has occurred, SIO2SR<RXERR> is set to “1”.
(3) Stopping the transmit/receive operation
There are two ways for stopping the transmit/receive operation.
• The way of clearing SIO2CR<SIOS>.
When SIO2CR<SIOS> is cleared to “0”, transmit/receive operation is stopped after all trans-
fer of the data is finished. When transmit/receive operation is finished, SIO2SR<SIOF> is
cleared to “0” and SO2 pin is kept in high level.
In external clock operation, SIO2CR<SIOS> must be cleared to “0” before SIO2SR<SEF> is
set to “1” by beginning next transfer.
• The way of setting SIO2CR<SIOINH>.
Transmit/receive operation is stopped immediately after SIO2CR<SIOINH> is set to “1”. In
this case, SIO2CR<SIOS>, SIO2SR register, SIO2RDB register and SIO2TDB register are
initialized.
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Страница 130: ...Page 8 1 4 Pin Names and Functions T5CL8 ...
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Страница 156: ...Page 34 2 Operational Description 2 3 Reset Circuit T5CL8 ...
Страница 186: ...Page 64 5 I O Ports 5 8 Port P7 P77 to P70 T5CL8 ...
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Страница 270: ...Page 148 12 Asynchronous Serial interface UART1 12 9 Status Flag T5CL8 ...
Страница 280: ...Page 158 13 Asynchronous Serial interface UART2 13 9 Status Flag T5CL8 ...
Страница 332: ...Page 210 16 Serial Bus Interface I2C Bus Ver D SBI 16 6 Data Transfer of I2C Bus T5CL8 ...
Страница 342: ...Page 220 17 10 bit AD Converter ADC 17 6 Precautions about AD Converter T5CL8 ...
Страница 354: ...Page 232 19 Flash Memory 19 4 Access to the Flash Memory Area T5CL8 ...
Страница 388: ...Page 266 21 Input Output Circuit 21 2 Input Output Ports T5CL8 ...
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Страница 398: ...Page 276 23 Package Dimensions T5CL8 ...
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