H8SLASH3021 datasheet(412/712 Pages) RENESAS

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11. Serial Communication Interface

Rev.2.00 Mar. 22, 2007 Page 388 of 684

REJ09B0352-0200

11.5

Usage Notes

Note the following points when using the SCI.

TDR Write and TDRE Flag: The TDRE flag in SSR is a status flag indicating the loading of

transmit data from TDR into TSR. The SCI sets the TDRE flag to 1 when it transfers data from

TDR to TSR.

Data can be written into TDR regardless of the state of the TDRE flag. If new data is written in

TDR when the TDRE flag is 0, the old data stored in TDR will be lost because this data has not

yet been transferred to TSR. Before writing transmit data in TDR, be sure to check that the TDRE

flag is set to 1.

Simultaneous Multiple Receive Errors: Table 11.13 indicates the state of SSR status flags when

multiple receive errors occur simultaneously. When an overrun error occurs the RSR contents are

not transferred to RDR, so receive data is lost.

Table 11.13 SSR Status Flags and Transfer of Receive Data

SSR Status Flags

Receive Data

Transfer

RDRF

ORER

FER

PER

RSR

→ RDR

Receive Errors

Not transferred

Overrun error

Transferred

Framing error

Transferred

Parity error

Not transferred

Overrun error + framing error

Not transferred

Overrun error + parity error

Transferred

Framing error + parity error

Not transferred

Overrun error + framing error + parity

error

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