tmp86fh46bng TOSHIBA Semiconductor CORPORATION, tmp86fh46bng Datasheet - Page 145

• Manufacturer Part Number: tmp86fh46bng
• Description: 8 Bit Microcontroller Tlcs-870/c Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

11.9.4
11.9.5
UARTSR<RBFL> is cleared to “0” when the RDBUF is read after reading the UARTSR.
mit 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.
RXD pin
RDBUF
UARTSR<RBFL>
INTRXD interrupt
Shift register
Loading the received data in RDBUF sets receive data buffer full flag UARTSR<RBFL> to "1". The
When no data is in the transmit buffer TDBUF, that is, when data in TDBUF are transferred to the trans-
UARTSR<RBFL>
RXD pin
RDBUF
UARTSR<OERR>
INTRXD interrupt
Receive Data Buffer Full
Transmit Data Buffer Empty
Shift register
Note:Receive operations are disabled until the overrun error flag UARTSR<OERR> is cleared.
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.
Figure 11-8 Generation of Receive Data Buffer Full
Figure 11-7 Generation of Overrun Error
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xxx0 **
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Final bit
Final bit
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xxxx0
xxxx0
*
*
Stop
Stop
1xxxx0
xxxx
1xxxx0
After reading UARTSR then
RDBUF clears RBFL.
After reading UARTSR then
RDBUF clears OERR.
TMP86FH46BNG