DF2505FC26V Renesas Electronics America, DF2505FC26V Datasheet - Page 589

• Manufacturer Part Number: DF2505FC26V
• Description: IC H8S/2505 MCU FLASH 144QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2500r

Specifications of DF2505FC26V

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 26MHz
• Connectivity: I²C, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 104
• Program Memory Size: 384KB (384K x 8)
• Program Memory Type: FLASH
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 16x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 144-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

17.1.1
The overview of the IEBus is described below.
• Communications method: Half duplex asynchronous communications
• Multi-master system
• Broadcast communications function (one-to-many communications)
• Mode is selectable (three modes with different transfer speeds).
Table 17.1 Mode Types
• Access control: CSMA/CD (Carrier Sense Multiple Access with Collision Detection)
• Communications scale
Note: The communications scale of the actual system depends on the externally mounted IEBus
(1)
A unit connected to the IEBus performs an operation for getting the bus to control other units.
This operation is called arbitration. In arbitration, when the multiple units start transfer
simultaneously, the bus mastership is given to one unit among them.
Mode
0
1
2
All units connected to the IEBus can transfer data to other units.
⎯ Group broadcast communications: Broadcast communications to group unit
⎯ General broadcast communications: Broadcast communications to all units
Priority of bus mastership is as follows.
⎯ Broadcast communications (one-to-many communications) have priority rather than
⎯ Smaller master address has priority.
⎯ Number of units: Up to 50
⎯ Cable length: Up to 150 m (when using a twisted pair cable)
Determination of Bus Mastership (Arbitration)
normal communications (one-to-one communications).
driver/receiver characteristics and the characteristics of the cable to be used.
φ = 12, 18, 24 MHz
About 3.9 kbps
About 17 kbps
About 26 kbps
IEBus Communications Protocol
φ = 12.58, 18.87, 25.16 MHz
About 4.1 kbps
About 18 kbps
About 27 kbps
Section 17 IEBus™ Controller (IEB) [H8S/2552 Group]
Rev. 6.00 Sep. 24, 2009 Page 541 of 928
Maximum Number Of
Transfer Bytes (byte/frame)
16
32
128
REJ09B0099-0600