tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 260
tmp89fm42
Manufacturer Part Number
tmp89fm42
Description
8 Bit Microcontroller
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP89FM42.pdf
(408 pages)
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17.5 Transfer Modes
17. Synchronous Serial Interface (SIO)
RA001
17.5.1.5 Stopping the transmit operation
shift operation is not in progress, the transmit operation is stopped immediately and an INTSIO0 interrupt
request is generated. When SIO0SR<SEF> is "1", the transmit operation is stopped after all the data in the
shift register is transmitted (reserved stop). At this time, an INTSIO0 interrupt request is generated again.
SIO0SR registers keep their values.
clock has been used, the SO0 pin keeps the last output value. To return the SO0 pin to the "H" level, write
"00" to SIO0CR<SIOM> when the operation is stopped.
By setting SIO0CR<SIOM> to "00", SIO0CR<SIOS> and SIO0SR are cleared to "0" and the SIO stops
the operation, regardless of the SIO0SR<SEF> value. The SO0 pin becomes the "H" level. If the internal
clock is selected, the SCLK0 pin returns to the initial level.
(1)
(2)
(3)
Set SIO0CR<SIOS> to "0" to stop the transmit operation. When SIO0SR<SEF> is "0", or when the
When the transmit operation is completed, SIO0SR<SIOF, SEF and TBFL> are cleared to "0". Other
If the internal clock has been used, the SO0 pin automatically returns to the "H" level. If an external
The transmit operation can be forced to stop by setting SIO0CR<SIOM> to "00" during the operation.
becomes the "H" level. SIO0SR<SEF> remains at "0". When the internal clock is used, the serial
clock and data output is stopped until the next transmit data is written into SIO0BUF (automatic
wait).
outputs the serial clock, and the transmit operation is restarted. An INTSIO0 interrupt request is gen-
erated at the restart of the transmit operation.
serial clock is input to the SCLK0 pin after completion of the data transmission, an undefined value
is transmitted and the transmit underrun error flag SIO0SR<UERR> is set to "1".
of an undefined value. (It is recommended to finish the transmit operation by setting
SIO0CR<SIOS> to "0" or force the transmit operation to stop by setting SIO0CR<SIOM> to "00".)
SIO0BUF is transferred to the shift register and the transmission of subsequent data is started. At this
time, SIO0SR<SEF> is set to "1" and an INTSIO0 interrupt request is generated.
When the internal clock is used and SIO0SR<TBFL> is "0"
When the data transmission is completed, the SCLK0 pin becomes the initial state and the SO0 pin
When the subsequent data is written into SIO0BUF, SIO0SR<SEF> is set to "1", the SCLK0 pin
When an external clock is used and SIO0SR<TBFL> is "0"
When the data transmission is completed, the SO pin keeps last output value. When an external
If a transmit underrun error occurs, data must not be written to SIO0BUF during the transmission
The transmit underrun error flag SIO0SR<UERR> is cleared by reading SIO0SR.
When an internal or external clock is used and SIO0SR<TBFL> is "1"
When the data transmission is completed, SIO0SR<TBFL> is cleared to "0". The data in
Page 246
TMP89FM42
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