7643 datasheet(152/424 Pages) RENESAS

152 / 424 page

Rev.2.00

Aug 28, 2006

page 31 of 202

7643 Group

REJ09B0133-0200

APPLICATION

2.3 Serial I/O

When the registers are set as shown in Figure 2.3.13, the serial I/O can transmit 1-byte data by

writing data into the serial I/O shift register.

Thus, after setting the CS signal to “L”, write the transmission data to the serial I/O shift register

by each 1 byte, and return the CS signal to “H” when all required data have been transmitted.

Figure 2.3.13 shows a control procedure of transmitter.

Fig. 2.3.13 Control procedure of transmitter

q x: This bit is not used here. Set it to “0” or “1” arbitrarily.

P3 (Address : 0E16), bit1

IREQC (Address : 0416), bit3?

Complete to transmit all data?

Initialization

SIOCON1

SIOCON2

P3D

IREQC

ICONC

(Address : 2B16)

(Address : 2C16)

(Address : 0E16), bit1

(Address : 0F16), bit1

(Address : 0416), bit3

(Address : 0716), bit3

010011002

000111002

IREQC (Address : 0416), bit3

SIOSHT (Address : 2A16)

P3 (Address : 0E16), bit1

Transmi-

ssion data

•Return the CS signal output level to “H”

when transmission of all data is completed

•Serial I/O interrupt request bit set to “0”

•Serial I/O interrupt disabled

•CS signal output port set

(“H” level output)

RESET

•Serial I/O set

CLI

•CS signal output level to “L” set

•Transmission data write

(Start of transmit 1-byte data)

•Judgment of completion of transmitting

1-byte data

•Use any of RAM area as a counter for counting

the number of transmitted bytes

•Judgment of completion of transmitting all data

7643 Datasheet(PDF) 152 Page - Renesas Technology Corp

7643 Datasheet(HTML) 152 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