Page 184
15. Synchronous Serial Interface (SIO2)
15.3 Function
T
5CL8
(2) During the transmit operation
When data is written to SIO2TDB, SIO2SR<TXF> is cleared to “0”.
In internal clock operation, in case a next transmit data is not written to SIO2TDB, the serial clock
stops to “H” level by an automatic-wait function when all of the bit set in the SIO2TDB has been
transmitted. Automatic-wait function is released by writing a transmit data to SIO2TDB. Then, trans-
mit operation is restarted after maximum 1-cycle of serial clock.
When the next data is written to the SIO2TDB before termination of previous 8-bit data with
SIO2SR<TXF> “1”, the next data is continuously transferred after transmission of previous data.
In external clock operation, after SIO2SR<TXF> is set to “1”, the transmit data must be written to
SIO2TDB before the shift operation of the next data begins.
If the transmit data is not written to SIO2TDB, transmit error occurs immediately after shift opera-
tion is started. Then, INTSIO2 interrupt request is generated after SIO2SR<TXERR> is set to “1”.
(3) Stopping the transmit operation
There are two ways for stopping transmits operation.
• The way of clearing SIO2CR<SIOS>.
When SIO2CR<SIOS> is cleared to “0”, transmit operation is stopped after all transfer of the
data is finished. When transmit 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 operation is stopped immediately after SIO2CR<SIOINH> is set to “1”. In this
case, SIO2CR<SIOS>, SIO2SR register, SIO2RDB register and SIO2TDB register are ini-
tialized.
Figure 15-6 Example of Internal Clock and MSB Transmit Mode
A6 A5 A4 A3 A2 A1 A0 B7 B6 B5 B4 B3 B2 B1
C7
A7 B0
C6 C5 C4 C3 C2 C1 C0
A B
C
Automatic wait
Start shift
operation
Start shift
operation
Start shift
operation
Writing transmit
data B
Writing transmit
data A
Writing transmit
data C
Clearing SIOS
SIO2CR<SIOS>
SIO2SR<SIOF>
SIO2SR<SEF>
SCK2 pin outout
SO2 pin
SIO2SR<TXF>
SIO2TDB
INTSIO2
interrupt
request
Содержание CEM2100/00
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Страница 130: ...Page 8 1 4 Pin Names and Functions T5CL8 ...
Страница 155: ...Page 33 T5CL8 ...
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 ...
Страница 194: ...Page 72 6 Watchdog Timer WDT 6 3 Address Trap T5CL8 ...
Страница 214: ...Page 92 8 16 Bit TimerCounter 1 TC1 8 3 Function T5CL8 ...
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 ...
Страница 397: ...Page 275 T5CL8 23 Package Dimensions LQFP64 P 1010 0 50D Rev 01 Unit mm ...
Страница 398: ...Page 276 23 Package Dimensions T5CL8 ...
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