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16. Asynchronous Serial Interface (UART)
16.13 Receiving Process
TMP89FM42
RA001
16.13Receiving Process
Figure 16-18 shows an example of the receiving process. Details of flag judgments in the processing are shown in
Table 16-10 and Table 16-11.
If any framing error or parity error is detected, the received data has erroneous value(s). Execute the error han-
dling, for example, by discarding the received data read from RD0BUF and receiving the data again.
If any overrun error is detected, the receiving of one or more pieces of data is unfinished. It is impossible to deter-
mine the number of pieces of data that could not be received. Execute the error handling, for example, by receiving
data again from the beginning of the transfer. Basically, an overrun error occurs when the internal software process-
ing cannot follow the data transfer speed. It is recommended to slow the transfer baud rate or modify the software to
execute flow control.
Figure 16-18 Example of Receiving Process
Note 1: If multiple interrupts are used in the INTRXD0 interrupt subroutine, the interrupt should be enabled after reading
UART0SR and RD0BUF.
Receiving process
END
When no receive interrupt is used
When a receive interrupt is used
Read UART0SR
Read RD0BUF
Error handling
Error handling
Error handling
Error handling
Data processing
(Received data is valid)
UART0SR<RBFL>
1
1
1
0
0
0
1
0
UART0SR<PERR>
Parity error
Framing error
Overrun error
Parity error
Framing error
Overrun error
UART0SR<FERR>
UART0SR<OERR>
INTRXD0 interrupt
subroutine
RETI
Read UART0SR
Read RD0BUF
Data processing
(Received data is valid)
1
1
0
0
1
0
UART0SR<PERR>
UART0SR<FERR>
UART0SR<OERR>
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: ......