SH7261 datasheet(910/1348 Pages) RENESAS

910 / 1348 page

Section 20 IEBus

TM Controller (IEB) [R5S72612] [R5S72613]

Rev. 2.00 Sep. 07, 2007 Page 878 of 1312

REJ09B0320-0200

(2)

Communications Mode

The IEBus has three communications modes with different transfer speeds. Table 20.2 shows the

transfer speed in each communications mode and the maximum number of transfer bytes in one

communications frame.

Table 20.2

Transfer Speed and Maximum Number of Transfer Bytes in Each

Communications Mode

Effective Transfer Speed*

1 (kbps)

Communications

Mode

Maximum Number

of Transfer Bytes

(bytes/frame)

IEB

φ*2 = 6, 12, 18, 24,

30, 36*

3 MHz

IEB

φ*2 = 6.29, 12.58, 18.87,

25.16, 31.45, 37.74*

3 MHz

About 3.9

About 4.1

About 17

About 18

128

About 26

About 27

Notes:

Each unit connected to the IEBus should select a communications mode prior to

performing communications. Note that correct communications is not guaranteed if the

master and slave units do not adopt the same communications mode.

In the case of communications between a unit with

φ = 6 MHz and a unit with φ = 6.29

MHz, correct communications are not possible even if the same communications mode

is adopted. Communications must be done with the same oscillation frequency.

1. Effective transfer speed when the maximum number of transfer bytes is transmitted.

2. Peripheral clock (P

φ), or clocks for AUDIO_X1 and AUDIO_X2

3. Oscillation frequency when this LSI is used

(3)

Communications Address

In the IEBus, a specific 12-bit communications address is allocated to each individual unit. A

communications address is configured as follows.

• Upper four bits: group number (number identifying a group to which the unit belongs)

• Lower eight bits: unit number (number identifying individual units in a group)

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