HD6432351 datasheet(636/1025 Pages) RENESAS

636 / 1025 page

Section 13 Serial Communication Interface (SCI)

Rev. 3.00 Sep 15, 2006 page 602 of 988

REJ09B0330-0300

In serial reception, the SCI operates as described below.

[1] The SCI performs internal initialization in synchronization with serial clock input or output.

[2] The received data is stored in RSR in LSB-to-MSB order.

After reception, the SCI checks whether the RDRF flag is 0 and the receive data can be

transferred from RSR to RDR.

If this check is passed, the RDRF flag is set to 1, and the receive data is stored in RDR. If a

receive error is detected in the error check, the operation is as shown in table 13.11.

Neither transmit nor receive operations can be performed subsequently when a receive error

has been found in the error check.

[3] If the RIE bit in SCR is set to 1 when the RDRF flag changes to 1, a receive data full interrupt

(RXI) request is generated.

Also, if the RIE bit in SCR is set to 1 when the ORER flag changes to 1, a receive error

interrupt (ERI) request is generated.

Figure 13.19 shows an example of SCI operation in reception.

Bit 7

Serial

data

Serial

clock

1 frame

RDRF

ORER

Bit 0

Bit 7

Bit 0

Bit 1

Bit 6

Bit 7

RXI interrupt request

generated

RDR data read and

RDRF flag cleared to 0

in RXI interrupt service

routine

RXI interrupt request

generated

ERI interrupt request

generated by overrun

error

Figure 13.19 Example of SCI Operation in Reception

Simultaneous serial data transmission and reception (clocked synchronous mode): Figure

13.20 shows a sample flowchart for simultaneous serial transmit and receive operations.

The following procedure should be used for simultaneous serial data transmit and receive

operations.

HD6432351 Datasheet(PDF) 636 Page - Renesas Technology Corp

HD6432351 Datasheet(HTML) 636 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

Datasheet Download

Link URL