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17. Synchronous Serial Interface (SIO)
17.5 Transfer Modes
TMP89FM42
RA001
(1)
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
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).
When the subsequent data is written into SIO0BUF, SIO0SR<SEF> is set to "1", the SCLK0 pin
outputs the serial clock, and the transmit operation is restarted. An INTSIO0 interrupt request is gen-
erated at the restart of the transmit operation.
(2)
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
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".
If a transmit underrun error occurs, data must not be written to SIO0BUF during the transmission
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".)
The transmit underrun error flag SIO0SR<UERR> is cleared by reading SIO0SR.
(3)
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
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.
17.5.1.5 Stopping the transmit operation
Set SIO0CR<SIOS> to "0" to stop the transmit operation. When SIO0SR<SEF> is "0", or when the
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.
When the transmit operation is completed, SIO0SR<SIOF, SEF and TBFL> are cleared to "0". Other
SIO0SR registers keep their values.
If the internal clock has been used, the SO0 pin automatically returns to the "H" level. If an external
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.
The transmit operation can be forced to stop by setting SIO0CR<SIOM> to "00" during the operation.
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.
Summary of Contents for TLCS-870/C1 Series
Page 1: ...8 Bit Microcontroller TLCS 870 C1 Series TMP89FM42 查询TMP89FM42供应商 捷多邦 专业PCB打样工厂 24小时加急出货 ...
Page 3: ...Revision History Date Revision 2007 10 25 1 First Release 2007 11 3 2 Contents Revised ...
Page 4: ......
Page 14: ......
Page 18: ...1 3 Block Diagram TMP89FM42 1 3 Block Diagram Figure 1 2 Block Diagram ...
Page 22: ...1 4 Pin Names and Functions TMP89FM42 ...
Page 60: ...2 CPU Core 2 5 Revision History TMP89FM42 ...
Page 76: ...3 Interrupt Control Circuit 3 8 Revision History TMP89FM42 ...
Page 86: ...4 External Interrupt control circuit 4 3 Function TMP89FM42 ...
Page 102: ...7 Voltage Detection Circuit 7 5 Revision History TMP89FM42 ...
Page 126: ...8 I O Ports 8 3 I O Port Registers TMP89FM42 Note 2 i 0 to 1 ...
Page 136: ...8 I O Ports 8 5 Revision History TMP89FM42 ...
Page 142: ...9 Special Function Registers 9 3 SFR3 0x0E40 to 0x0EFF TMP89FM42 ...
Page 146: ...10 Low Power Consumption Function for Peripherals TMP89FM42 ...
Page 149: ...TMP89FM42 11 3 Revision History Rev Description RA001 Deleted SLEEP2 description ...
Page 150: ...11 Divider Output DVO 11 3 Revision History TMP89FM42 ...
Page 220: ...15 Real Time Clock RTC 15 4 Real Time Clock Operation TMP89FM42 ...
Page 250: ...16 Asynchronous Serial Interface UART 16 15 Revision History TMP89FM42 ...
Page 302: ...18 Serial Bus Interface SBI 18 7 Revision History TMP89FM42 ...
Page 338: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 ...
Page 384: ...22 Serial PROM Mode 22 15 Revision History TMP89FM42 ...
Page 388: ...24 Input Output Circuit 24 1 Control Pins TMP89FM42 ...
Page 404: ...25 Electrical Characteristics 25 11 Revision History TMP89FM42 ...
Page 406: ...26 Package Dimensions TMP89FM42 ...
Page 408: ......