tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 268

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

17.5 Transfer Modes
17. Synchronous Serial Interface (SIO)
RA001
17.5.3 8-bit transmit/receive mode
17.5.3.1 Setting
17.5.3.2 Starting the transmit/receive operation
17.5.3.3 Transmit buffer and shift operation
17.5.3.4 Operation on completion of transmission/reception
The 8-bit transmit/receive mode is selected by setting SIO0CR<SIOM> to "11".
fer format at SIO0CR<SIODIR> and a serial clock at SIO0CR<SIOCKS>. To use the internal clock as the
serial clock, select an appropriate serial clock at SIO0CR<SIOCKS>. To use an external clock as the
serial clock, set SIO0CR<SIOCKS> to "111".
setting SIO0CR<SIOS> to "1".
in progress, or when SIO0SR<SIOF> is "1". Make these settings while the serial communication is
stopped. While the serial communication is in progress (SIO0SR<SIOF>="1"), only writing "00" to
SIO0CR<SIOM> or writing "0" to SIOCR<SIOS> is valid.
to "1". The transmit data is transferred from SIO0BUF to the shift register, and the serial data is transmit-
ted from the SO0 pin according to the settings of SIO0CR<SIOEDG, SIOCKS and SIODIR>. At the same
time, the serial data is received from the SI0 pin according to the settings of SIO0CR<SIOEDG, SIOCKS
and SIODIR>.
In the external clock operation, an external clock must be supplied to the SCLK0 pin.
transmit data to SIO0BUF.
INTSIO0 interrupt request is generated.
empty, the written data is transferred to the shift register immediately. At this time, SIO0SR<TBFL>
remains at "0".
to "1". If new data is written to SIO0BUF in this state, the contents of SIO0BUF are overwritten by the
new value. Make sure that SIO0SR<TBFL> is "0" before writing data to SIO0BUF.
interrupt request is generated. The operation varies depending on the operating clock.
Before starting the transmit/receive operation, select the transfer edges at SIO0CR<SIOEDG>, a trans-
The 8-bit transmit/receive mode is selected by setting SIO0CR<SIOM> to "11".
The transmit/receive operation is started by writing the first byte of transmit data to SIO0BUF and then
Writing data to SIO0CR<SIOEDG, SIOCKS and SIODIR> is invalid when the serial communication is
The transmit/receive operation is started by writing data to SIO0BUF and then setting SIO0CR<SIOS>
In the internal clock operation, the serial clock of the selected baud rate is output from the SCLK0 pin.
The transmit data becomes undefined if the transmit/receive operation is started without writing any
By setting SIO0CR<SIOS> to "1", SIO0SR<SIOF and SEF> are automatically set to "1" and an
SIO0SR<SEF> is cleared to "0" when the 8th bit of data is received.
If any data is written to SIO0BUF when the serial communication is in progress and the shift register is
If any data is written to SIO0BUF when some data remains in the shift register, SIO0SR<TBFL> is set
When the data transmission/reception is completed, SIO0SR<REND> is set to "1" and an INTSIO0
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