SH7721 datasheet(695/1524 Pages) RENESAS

695 / 1524 page

Section 18

Serial Communication Interface with FIFO (SCIF)

Rev. 3.00 Jan. 18, 2008 Page 633 of 1458

REJ09B0033-0300

(6)

Data Transfer Operations (Simultaneous Serial Data Transmission and Reception)

Figure 18.16 shows sample flowcharts for simultaneous serial transmission and reception.

Yes

1. Set the receive trigger number

in SCFCR.

2. Write the remaining transmit data

to SCFTDR, and if there is receive

data in the FIFO, read receive data

until there is less than the receive

trigger setting number, read the

TDFE and RDF bits in SCSSR, and

if 1, clear to 0.

3. Transmission/reception is started

when the TE and RE bits in SCSCR

are set to 1. The TE and RE bits

must be set simultaneously.

4. After the end of transmission/reception,

clear the TE and RE bits to 0.

Start of simultaneous

transmission/reception

Set receive trigger number in RTRG1

and RTRG0 in SCFCR

Write remaining transmit data to SCFTDR

Read TDFE and RDF bits in SCSSR

TDFE =1?

RDF =1?

Write 0 to TDFE and RDF bits in

SCSSR after reading 1 from them

Set TE and RE bits in SCSCR

simultaneously

When using transmit FIFO data interrupt,

set TIE bit to 1

When using receive FIFO data interrupt,

set RIE bit to 1

TDFE =1?

RDF =1?

Read receive trigger number of receive

data bytes from SCFRDR

Clear TE and RE bits in SCSCR to 0

End of

transmission/reception

Figure 18.16

Sample Simultaneous Serial Transmission and Reception Flowchart (1)

(First Transfer after Initialization)

SH7721 Datasheet(PDF) 695 Page - Renesas Technology Corp

SH7721 Datasheet(HTML) 695 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