H8SLASH3003 datasheet(496/715 Pages) RENESAS

496 / 715 page

13.5 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 13-13 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 13-13 SSR Status Flags and Transfer of Receive Data

Receive Data

Transfer

RDRF

ORER

FER

PER

RSR

→ RDR

Receive Errors

1100

Overrun error

0010

Framing error

0001

Parity error

1110

Overrun error + framing error

1101

Overrun error + parity error

0011

Framing error + parity error

1111

Overrun error + framing error + parity error

Notes:

: Receive data is transferred from RSR to RDR.

× Receive data is not transferred from RSR to RDR.

SSR Status Flags

478

H8/3003 数据表(PDF) 496 Page - Renesas Technology Corp

H8/3003 数据表(HTML) 496 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载