Page 227
TMP89FM42
RA001
16.12.3Overrun error
If receiving of all data bits is completed before the previous received data is read from RD0BUF, the overrun
error flag UART0SR<OERR> is set to "1" and an INTRXD0 interrupt request is generated. The data received
at the occurrence of the overrun error is discarded and the previous received data is maintained. Subsequently,
if data is received while UART0SR<OERR> is still "1", no INTRXD0 interrupt request is generated, and the
received data is discarded. (Figure 16-12)
Note that parity or framing errors in the discarded received data cannot be detected. (These error flags are not
set.) That is to say, if these errors are detected together with an overrun error during the reading of UART0SR,
they have occurred in the previous received data (the data stored in RD0BUF). (Figure 16-13)
If UART0SR<OERR> is "1" when UART0SR is read, UART0SR<OERR> will be cleared to "0" when
RD0BUF is read subsequently. (Figure 16-14)
If UART0SR<OERR> is set to "1" after UART0SR is read, UART0SR<OERR> will not be cleared to "0"
when RD0BUF is read subsequently. In this case, UART0SR<OERR> will be cleared to "0" when UART0SR
is read again and RD0BUF is read. (Figure 16-14)
Figure 16-12 Generation of INTRXD0 Interrupt Request
RXD0 pin input
Data A
Data A
An interrupt request
is generated.
The flag is set.
An interrupt request
is generated.
No interrupt
request is
generated.
Data B
INTRXD0 interrupt request
UART0SR<OERR>
UART0SR<RBFL>
Start
Bit0
Bit1 Bit7
Stop
Start
Bit0
Bit1 Bit7
Stop
RD0BUF
Start
Bit0
Bit1 Bit7
Stop
Data C
The contents of data B are discarded
and those of data A are maintained.
The contents of data C are discarded
and those of data A are maintained.
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: ......