TMP86CS44UG datasheet(142/172 Pages) TOSHIBA

142 / 172 page

Page 132

12. Asynchronous Serial interface (UART )

12.9 Status Flag

TMP86CS44UG

Figure 12-7 Generation of Overrun Error

Note:Receive operations are disabled until the overrun error flag UARTSR<OERR> is cleared.

12.9.4 Receive Data Buffer Full

Loading the received data in RDBUF sets receive data buffer full flag UARTSR<RBFL> to "1". The

UARTSR<RBFL> is cleared to “0” when the RDBUF is read after reading the UARTSR.

Figure 12-8 Generation of Receive Data Buffer Full

Note:If the overrun error flag UARTSR<OERR> is set during the period between reading the UARTSR and reading

the RDBUF, it cannot be cleared by only reading the RDBUF. Therefore, after reading the RDBUF, read the

UARTSR again to check whether or not the overrun error flag which should have been cleared still remains

set.

12.9.5 Transmit Data Buffer Empty

When no data is in the transmit buffer TDBUF, that is, when data in TDBUF are transferred to the transmit

shift register and data transmit starts, transmit data buffer empty flag UARTSR<TBEP> is set to “1”. The

UARTSR<TBEP> is cleared to “0” when the TDBUF is written after reading the UARTSR.

Final bit

Stop

Shift register

xxxx0*

1xxxx0

yyyy

xxx0**

RXD pin

UARTSR<OERR>

INTRXD interrupt

After reading UARTSR then

RDBUF clears OERR.

RDBUF

UARTSR<RBFL>

Final bit

Stop

Shift register

xxxx0*

1xxxx0

xxxx

yyyy

xxx0**

RXD pin

UARTSR<RBFL>

INTRXD interrupt

RDBUF

After reading UARTSR then

RDBUF clears RBFL.

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