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17. Synchronous Serial Interface (SIO)
17.5 Transfer Modes
TMP89FM42
RA001
17.5.2 8-bit Receive Mode
The 8-bit receive mode is selected by setting SIO0CR<SIOM> to "10".
17.5.2.1 Setting
As in the case of the transmit mode, before starting the receive operation, select the transfer edges at
SIO0CR<SIOEDG>, a transfer 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".
The 8-bit receive mode is selected by setting SIO0CR<SIOM> to "10".
Reception is started by setting SIO0CR<SIOS> to "1".
Writing data to SIO0CR<SIOEDG, SIOCKS and SIODIR> is invalid when the serial communication is
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 SIO0CR<SIOS> is valid.
17.5.2.2 Starting the receive operation
Reception is started by setting SIO0CR<SIOS> to "1". External serial data is taken into the shift register
from the SI0 pin according to the settings of SIO0CR<SIOEDG, SIOCKS and SIODIR>.
In the internal clock operation, the serial clock of the selected baud rate is output from the SCLK0 pin.
In the external clock operation, an external clock must be supplied to the SCLK0 pin.
By setting SIO0CR<SIOS> to "1", SIO0SR<SIOF and SEF> are automatically set to "1".
17.5.2.3 Operation on completion of reception
When the data reception is completed, the data is transferred from the shift register to SIO0BUF and an
INTSIO0 interrupt request is generated. The receive completion flag SIO0SR<REND> is set to "1".
In the operation with the internal clock, the serial clock output is stopped until the receive data is read
from SIO0BUF (automatic wait). At this time, SIO0SR<SEF> is set to "0". By reading the receive data
from SIO0BUF, SIO0SR<SEF> is set to "1", the serial clock output is restarted and the receive operation
continues.
In the operation with an external clock, data can be continuously received without reading the received
data from SIO0BUF. In this case, data must be read from SIO0BUF before the subsequent data has been
fully received. If the subsequent data is received completely before reading data from SIO0BUF, the over-
run error flag SIO0SR<OERR> is set to "1". When an overrun error has occurred, set SIO0CR<SIOM> to
"00" to abort the receive operation. The data received at the occurrence of an overrun error is discarded,
and SIO0BUF holds the data value received before the occurrence of the overrun error.
SIO0SR<REND> is cleared to "0" by reading data from SIO0BUF. SIO0SR<OERR> is cleared by
reading SIO0SR.
17.5.2.4 Stopping the receive operation
Set SIO0CR<SIOS> to "0" to stop the receive operation. When SIO0SR<SEF> is "0", or when the shift
operation is not in progress, the operation is stopped immediately. Unlike the transmit mode, no INTSIO0
interrupt request is generated in this state.
When SIO0SR<SEF> is "1", the operation is stopped after the 8-bit data has been completely received
(reserved stop). At this time, an INTSIO0 interrupt request is generated.
Содержание TLCS-870/C1 Series
Страница 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 ...
Страница 3: ...Revision History Date Revision 2007 10 25 1 First Release 2007 11 3 2 Contents Revised ...
Страница 4: ......
Страница 14: ......
Страница 18: ...1 3 Block Diagram TMP89FM42 1 3 Block Diagram Figure 1 2 Block Diagram ...
Страница 22: ...1 4 Pin Names and Functions TMP89FM42 ...
Страница 60: ...2 CPU Core 2 5 Revision History TMP89FM42 ...
Страница 76: ...3 Interrupt Control Circuit 3 8 Revision History TMP89FM42 ...
Страница 86: ...4 External Interrupt control circuit 4 3 Function TMP89FM42 ...
Страница 102: ...7 Voltage Detection Circuit 7 5 Revision History TMP89FM42 ...
Страница 126: ...8 I O Ports 8 3 I O Port Registers TMP89FM42 Note 2 i 0 to 1 ...
Страница 136: ...8 I O Ports 8 5 Revision History TMP89FM42 ...
Страница 142: ...9 Special Function Registers 9 3 SFR3 0x0E40 to 0x0EFF TMP89FM42 ...
Страница 146: ...10 Low Power Consumption Function for Peripherals TMP89FM42 ...
Страница 149: ...TMP89FM42 11 3 Revision History Rev Description RA001 Deleted SLEEP2 description ...
Страница 150: ...11 Divider Output DVO 11 3 Revision History TMP89FM42 ...
Страница 220: ...15 Real Time Clock RTC 15 4 Real Time Clock Operation TMP89FM42 ...
Страница 250: ...16 Asynchronous Serial Interface UART 16 15 Revision History TMP89FM42 ...
Страница 302: ...18 Serial Bus Interface SBI 18 7 Revision History TMP89FM42 ...
Страница 336: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 Note 1 Make sure that you set the C register to 0x00 LD FLSCR2 0xD5 ...
Страница 338: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 ...
Страница 384: ...22 Serial PROM Mode 22 15 Revision History TMP89FM42 ...
Страница 388: ...24 Input Output Circuit 24 1 Control Pins TMP89FM42 ...
Страница 404: ...25 Electrical Characteristics 25 11 Revision History TMP89FM42 ...
Страница 406: ...26 Package Dimensions TMP89FM42 ...
Страница 408: ......