H8SSLASH2224 datasheet(759/1071 Pages) RENESAS

759 / 1071 page

Section 16 I

2C Bus Interface (IIC) (Option)

Rev. 5.00 Aug 08, 2006 page 673 of 982

REJ09B0054-0500

16.4.8 Operation Using the DTC

The I2C bus format provides for selection of the slave device and transfer direction by means of

the slave address and the R/

W bit, confirmation of reception with acknowledge bit, indication of

the last frame, and so on. Therefore, continuous data transfer using the DTC must be carried out in

conjunction CPU processing by means of interrupts.

Table 16.5 shows some example of processing using the DTC. These examples assume that the

number of transfer data bytes is know in slave mode.

Table 16.5 Flags and Transfer States

Item

Master Transmit

Mode

Master Receive

Mode

Slave Transmit

Mode

Slave Receive

Mode

Slave address +

W bit

Transmission/

reception

Transmission by

DTC (ICDR write)

Transmission by

CPU (ICDR write)

Reception by CPU

(ICDR read)

Reception by CPU

(ICDR read)

Dummy data

read



Processing by

CPU (ICDR read)



Actual data

transmission/rec

eption

Transmission by

DTC (ICDR write)

Reception by

DTC (ICDR read)

Transmission by

DTC (ICDR write)

Reception by DTC

(ICDR read)

Dummy data

(H'FF) write



Processing by DTC

(ICDR write)



Last frame

processing

Not necessary

Reception by

CPU (ICDR read)

Not necessary

Reception by CPU

(ICDR read)

Transfer request

processing after

last frame

processing

1st time: Clearing

by CPU

2nd time: End

condition issuance

by CPU

Not necessary

Automatic clearing

on detection of end

condition during

transmission of

dummy data (H'FF)

Not necessary

Setting of

number of DTC

transfer data

frames

Transmission:

Actual data count

+ 1 (+ 1 equivalent

to slave address +

W bits)

Reception: Actual

data count

Transmission:

Actual data count +

1 (+ 1 equivalent to

dummy data (H'FF))

Reception: Actual

data count

H8S/2224 Scheda tecnica(PDF) 759 Page - Renesas Technology Corp

H8S/2224 Scheda tecnica(HTML) 759 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

Scheda tecnica Scarica

Link URL