DF2378BVFQ35V Renesas Electronics America, DF2378BVFQ35V Datasheet - Page 458

• Manufacturer Part Number: DF2378BVFQ35V
• Description: IC H8S/2378 MCU FLASH 144-LQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2378BVFQ35V

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 35MHz
• Connectivity: I²C, IrDA, SCI, SmartCard
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 97
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x10b; D/A 6x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 144-LQFP
• For Use With: YLCDRSK2378 - KIT DEV EVAL H8S/2378 LCDYR0K42378FC000BA - KIT EVAL FOR H8S/2378HS0005KCU11H - EMULATOR E10A-USB H8S(X),SH2(A)EDK2378 - DEV EVAL KIT FOR H8S/2378
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Section 8 EXDMA Controller (EXDMAC)
IRF Bit in EDMDR: The IRF bit in EDMDR is set to 1 when an interrupt request source occurs.
If the EDIE bit in EDMDR is 1 at this time, an interrupt is requested.
The timing for setting the IRF bit to 1 is when the EDA bit in EDMDR is cleared to 0 and transfer
ends following the end of the DMA transfer bus cycle in which the source generating the interrupt
occurred.
If the EDA bit is set to 1 and transfer is resumed during interrupt handling, the IRF bit is
automatically cleared to 0 and the interrupt request is cleared.
For details on interrupts, see section 8.5, Interrupt Sources.
8.4.8
The priority order of the EXDMAC channels is: channel 2 > channel 3. Table 8.3 shows the
EXDMAC channel priority order.
Table 8.3
Channel
Channel 2
Channel 3
If transfer requests occur simultaneously for a number of channels, the highest-priority channel
according to the priority order in table 8.3 is selected for transfer.
Transfer Requests from Multiple Channels (Except Auto Request Cycle Steal Mode): If
transfer requests for different channels are issued during a transfer operation, the highest-priority
channel (excluding the currently transferring channel) is selected. The selected channel begins
transfer after the currently transferring channel releases the bus. If there is a bus request from a bus
master other than the EXDMAC at this time, a cycle for the other bus master is initiated. If there is
no other bus request, the bus is released for one cycle.
Channel switching does not take place during a burst transfer or a block transfer of a single block.
Figure 8.13 shows a case in which transfer requests for channels 2 and 3 are issued
simultaneously. The example shown in the figure illustrates the handling of external requests in
the cycle steal mode.
Rev.7.00 Mar. 18, 2009 page 390 of 1136
REJ09B0109-0700
Channel Priority Order
EXDMAC Channel Priority Order
Priority
High
Low