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TMP89FS60 Datasheet(PDF) 240 Page - Toshiba Semiconductor |
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TMP89FS60 Datasheet(HTML) 240 Page - Toshiba Semiconductor |
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240 / 410 page  Page 226 16. Asynchronous Serial Interface (UART) 16.12 Status Flag TMP89FS60 RA001 16.12.2Framing Error If the internal and external baud rates differ or "0" is sampled as the stop bit of received data due to the influ- ence of noise on the RXD0 pin, the framing error flag UART0SR<FERR> is set to "1". At this time, an INTRXD0 interrupt request is generated. If UART0SR<FERR> is "1" when UART0SR is read, UART0SR<FERR> will be cleared to "0" when RD0BUF is read subsequently. If UART0SR<FERR> is set to "1" after UART0SR is read, UART0SR<FERR> will not be cleared to "0" when RD0BUF is read subsequently. In this case, UART0SR<FERR> will be cleared to "0" when UART0SR is read again and RD0BUF is read. Figure 16-11 Occurrence of Framing Error RXD0 pin input A falling edge is detected FERR is generated if “0” is received in the sampling of the stop bit. FERR is cleared to “0” when RD0BUF is read after reading FERR=“1”. FERR is cleared to “0” when RD0BUF is read after reading FERR=“1”. Sampling INTRXD0 interrupt request UART0SR<FERR> When the external baud rate is slower than the internally set baud rate When the external baud rate is faster than the internally set baud rate Start Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 Stop Start Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 Stop Reading of UART0SR Reading of RD0BUF RXD0 pin input A falling edge is detected A falling edge is detected FERR is generated if “0” is received in the sampling of the stop bit. Sampling INTRXD0 interrupt request UART0SR<FERR> Start Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 Stop Start Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 Stop Start Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 Stop Start Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Reading of UART0SR Reading of RD0BUF RD0BUF Indeterminate Data reading RD0BUF Indeterminate Data reading |
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