DF2505FC26V Renesas Electronics America, DF2505FC26V Datasheet - Page 590

• 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: -

Section 17 IEBus™ Controller (IEB) [H8S/2552 Group]
Only one unit can get bus mastership through arbitration, so the following priority for bus
mastership is defined.
(a) Priority according to communications type
(b) Priority according to master address
(2)
The IEBus has three communications modes with different transfer speeds. Table 17.2 shows the
transfer speed in each communications mode and the maximum number of transfer bytes in one
communications frame.
Table 17.2 Transfer speed and Maximum Number of Transfer Bytes in Each
Notes:
Rev. 6.00 Sep. 24, 2009 Page 542 of 928
REJ09B0099-0600
Communications
Mode
0
1
2
Note: When a unit loses arbitration, the unit can automatically enter retransfer mode (0 to 7
Broadcast communications (one-to-many communications) has priority over normal
communications (one-to-one communications).
A unit with the smallest master address has priority among units with the same
communications type.
Example: The master address is configured with 12 bits. A unit with H'000 has the highest
priority, and a unit with H'FFF has the lowest priority.
Communications Mode
1. An effective transfer speed when the maximum number of transfer bytes is transmitted.
2. Oscillation frequency when this LSI is used
retransfer times can be selected by bits RN2 to RN0 in IEMCR).
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 = 12 MHz and a unit with φ =
12.58 MHz, correct communications is not possible even if the same communications
mode is adopted. This is similar to the case of communications between a unit with φ =
24 MHz and a unit with φ = 25.16 MHz, or between a unit with φ = 18 MHz and a unit
with φ = 18.87 MHz. Communications must be performed at the same oscillation
frequency.
Communications Mode
Maximum Number
of Transfer Bytes
(byte/frame)
16
32
128
φ = 12, 18, 24 MHz*
About 3.9
About 17
About 26
Effective Transfer Speed*
2
φ = 12.58, 18.87, 25.16 MHz*
About 4.1
About 18
About 27
1
(kbps)
2