H8SLASH3028F datasheet(529/923 Pages) RENESAS

529 / 923 page

Rev. 2.00, 09/03, page 499 of 890

Transmitting and Receiving Data

SCI Initialization (Synchronous Mode): Before transmitting or receiving data, clear the TE and

RE bits to 0 in SCR, then initialize the SCI as follows.

When changing the communication mode or format, always clear the TE and RE bits to 0 before

following the procedure given below. Clearing TE to 0 sets the TDRE flag to 1 and initializes

TSR. Note that clearing RE to 0, however, does not initialize the RDRF, PER, and ORE flags, or

RDR, which retain their previous contents.

Figure 13.15 shows a sample flowchart for initializing the SCI.

(4)

(3)

(2)

(1)

Start of initialization

Yes

Wait

1-bit interval elapsed?

Set value in BRR

Clear TE and RE bits to 0 in SCR

Select communication format

in SMR

Set RIE, TIE, TEIE, MPIE, CKE1,

and CKE0 bits in SCR (leaving

TE and RE bits cleared to 0)

Set TE or RE bit to 1 in SCR

Set RIE, TIE, TEIE, and MPIE

bits as necessary

(1)

(2)

(3)

(4)

Note: *

Set the clock source in SCR. Clear the RIE,

TIE, TEIE, MPIE, TE, and RE bits to 0.*

Select the communication format in SMR.

Write the value corresponding to the bit rate in

BRR.

This step is not necessary when an external

clock is used.

Wait for at least the interval required to transmit

or receive one bit, then set the TE or RE bit to

1 in SCR.* Set the RIE, TIE, TEIE, and MPIE

bits as necessary. Setting the TE or RE bit

enables the SCI to use the TxD or RxD pin.

In simultaneous transmitting and receiving,

the TE and RE bits should be cleared to 0 or

set to 1 simultaneously.

Figure 13.15 Sample Flowchart for SCI Initialization

H8/3028F 数据表(PDF) 529 Page - Renesas Technology Corp

H8/3028F 数据表(HTML) 529 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