DF3048BVX25V Renesas Electronics America, DF3048BVX25V Datasheet - Page 254

• Manufacturer Part Number: DF3048BVX25V
• Description: MCU 3/5V 128K PB-FREE 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Hr

Specifications of DF3048BVX25V

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Section 8 DMA Controller
The transfer count is specified as a 16-bit value in ETCR. The ETCR value is decremented by 1 at
each transfer. When the ETCR value reaches H'0000, the DTE bit is cleared, the transfer ends, and
a CPU interrupt is requested. The maximum transfer count is 65,536, obtained by setting ETCR to
H'0000.
Transfers can be requested (activated) by compare match/input capture A interrupts from ITU
channels 0 to 3, transmit-data-empty and receive-data-full interrupts from SCI channel 0, and
external request signals.
For the detailed settings see section 8.2.4, Data Transfer Control Registers (DTCR).
Figure 8.5 shows a sample setup procedure for idle mode.
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destination addresses
Set transfer count
Idle mode setup
Set source and
Read DTCR
Set DTCR
Idle mode
Figure 8.5 Idle Mode Setup Procedure (Example)
1
2
3
4
1.
2.
3.
4.
Set the source and destination addresses
in MAR and IOAR. The transfer direction is deter-
mined automatically from the activation source.
Set the transfer count in ETCR.
Read DTCR while the DTE bit is cleared to 0.
Set the DTCR bits as follows.
•
•
•
•
Select the DMAC activation source with bits
DTS2 to DTS0.
Set the DTIE and RPE bits to 1 to select idle mode.
Select byte size or word size with the DTSZ bit.
Set the DTE bit to 1 to enable the transfer.