DF2148RTE20IV Renesas Electronics America, DF2148RTE20IV Datasheet - Page 224

• Manufacturer Part Number: DF2148RTE20IV
• Description: MCU 5V 128K I-TEMP,PB-FREE, 100-
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2100r

Specifications of DF2148RTE20IV

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: Host Interface, I²C, IrDA, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 74
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Section 6 Bus Controller
6.7.3
Even if a bus request is received from a bus master with a higher priority than that of the bus
master that has acquired the bus and is currently operating, the bus is not necessarily transferred
immediately. There are specific times at which each bus master can relinquish the bus.
CPU
The CPU is the lowest-priority bus master, and if a bus request is received from the DTC, the bus
arbiter transfers the bus to the DTC. The timing for transfer of the bus is as follows:
DTC
The DTC sends the bus arbiter a request for the bus when an activation request is generated.
The DTC does not release the bus until it has completed a series of processing operations.
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REJ09B0327-0400
The bus is transferred at a break between bus cycles. However, if a bus cycle is executed in
discrete operations, as in the case of a longword-size access, the bus is not transferred between
the operations.
See appendix A.5, Bus States during Instruction Execution, for timings at which the bus is not
transferred.
If the CPU is in sleep mode, it transfers the bus immediately.
Bus Transfer Timing