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SH7261 Datasheet(PDF) 908 Page - Renesas Technology Corp

Part # SH7261
Description  32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series
PDF  1348 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7261 Datasheet(HTML) 908 Page - Renesas Technology Corp

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Section 20 IEBus
TM Controller (IEB) [R5S72612] [R5S72613]
Rev. 2.00 Sep. 07, 2007 Page 876 of 1312
REJ09B0320-0200
20.1.1
IEBus Communications Protocol
An overview of the IEBus is provided below.
• Communications method: Half-duplex asynchronous communications
• Multi-master system
All units connected to the IEBus can transfer data to other units.
• Broadcast communications function (one-to-many communications)
 Group broadcast communications: Broadcast communications to group unit
 General broadcast communications: Broadcast communications to all units
• Mode is selectable (three modes with different transfer speeds)
Table 20.1
Mode Types
Mode
IEB
φ*1 = 6, 12, 18, 24,
30, 36*
2 MHz
IEB
φ*1 = 6.29, 12.58, 18.87,
25.16, 31.45, 37.74*
2 MHz
Maximum Number Of
Transfer Bytes (byte/frame)
0
About 3.9 kbps
About 4.1 kbps
16
1
About 17 kbps
About 18 kbps
32
2
About 26 kbps
About 27 kbps
128
Notes: 1. Peripheral clock (P
φ), or clocks for AUDIO_X1 and AUDIO_X2
2. Oscillation frequency when this LSI is used
• Access control: CSMA/CD (Carrier Sense Multiple Access with Collision Detection)
Priority of bus mastership is as follows.
 Broadcast communications (one-to-many communications) have priority over normal
communications (one-to-one communications).
 A smaller master address has priority.
• Communications scale
 Number of units: Up to 50
 Cable length: Up to 150 m (when using a twisted-pair cable)
Note:
The communications scale of the actual system depends on the characteristics of the
externally mounted IEBus driver/receiver and the cable used.



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