TMP86C847UG Datasheet, PDF(132/160 Page) Toshiba Semiconductor

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TMP86C847UG Datasheet, PDF (132/160 Pages) Toshiba Semiconductor – 8 Bit Microcontroller

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11. Asynchronous Serial interface (UART )

11.6 STOP Bit Length

TMP86C847UG

11.6 STOP Bit Length

Select a transmit stop bit length (1 bit or 2 bits) by UARTCR1<STBT>.

11.7 Parity

Set parity / no parity by UARTCR1<PE> and set parity type (Odd- or Even-numbered) by UARTCR1<EVEN>.

11.8 Transmit/Receive Operation

11.8.1 Data Transmit Operation

Set UARTCR1<TXE> to â1â. Read UARTSR to check UARTSR<TBEP> = â1â, then write data in TDBUF

(Transmit data buffer). Writing data in TDBUF zero-clears UARTSR<TBEP>, transfers the data to the trans-

mit shift register and the data are sequentially output from the TXD pin. The data output include a one-bit start

bit, stop bits whose number is specified in UARTCR1<STBT> and a parity bit if parity addition is specified.

Select the data transfer baud rate using UARTCR1<BRG>. When data transmit starts, transmit buffer empty

flag UARTSR<TBEP> is set to â1â and an INTTXD interrupt is generated.

While UARTCR1<TXE> = â0â and from when â1â is written to UARTCR1<TXE> to when send data are

written to TDBUF, the TXD pin is fixed at high level.

When transmitting data, first read UARTSR, then write data in TDBUF. Otherwise, UARTSR<TBEP> is not

zero-cleared and transmit does not start.

11.8.2 Data Receive Operation

Set UARTCR1<RXE> to â1â. When data are received via the RXD pin, the receive data are transferred to

RDBUF (Receive data buffer). At this time, the data transmitted includes a start bit and stop bit(s) and a parity

bit if parity addition is specified. When stop bit(s) are received, data only are extracted and transferred to

RDBUF (Receive data buffer). Then the receive buffer full flag UARTSR<RBFL> is set and an INTRXD

interrupt is generated. Select the data transfer baud rate using UARTCR1<BRG>.

If an overrun error (OERR) occurs when data are received, the data are not transferred to RDBUF (Receive

data buffer) but discarded; data in the RDBUF are not affected.

Note:When a receive operation is disabled by setting UARTCR1<RXE> bit to â0â, the setting becomes valid when

data receive is completed. However, if a framing error occurs in data receive, the receive-disabling setting

may not become valid. If a framing error occurs, be sure to perform a re-receive operation.

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