DF3052BX25V Renesas Electronics America, DF3052BX25V Datasheet - Page 247

• Manufacturer Part Number: DF3052BX25V
• Description: MCU 5V 512K 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Hr

Specifications of DF3052BX25V

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 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: -

8.4.5
In normal mode the A and B channels are combined. One byte or word is transferred per request.
A designated number of these transfers are executed. Addresses are specified in MARA and
MARB. Table 8.9 indicates the register functions in I/O mode.
Table 8.9
Register
Legend:
MARA: Memory address register A
MARB: Memory address register B
ETCRA: Execute transfer count register A
The source and destination addresses are both 24-bit addresses. MARA specifies the source
address. MARB specifies the destination address. MARA and MARB can be independently
incremented, decremented, or held fixed as data is transferred.
The transfer count is specified as a 16-bit value in ETCRA. The ETCRA value is decremented by
1 at each transfer. When the ETCRA value reaches H'0000, the DTE bit is cleared and the transfer
ends. If the DTIE bit is set, a CPU interrupt is requested at this time. The maximum transfer count
is 65,536, obtained by setting ETCRA to H'0000.
Figure 8.8 illustrates how normal mode operates.
23
23
15
Normal Mode
MARA
MARB
Register Functions in Normal Mode
ETCRA
0
0
0
Function
Source address
register
Destination
address register
Transfer counter
Initial Setting
Source address
Destination
address
Number of
transfers
Rev. 3.00 Mar 21, 2006 page 217 of 814
Section 8 DMA Controller
Operation
Incremented or
decremented once per
transfer, or held fixed
Incremented or
decremented once per
transfer, or held fixed
Decremented once per
transfer
REJ09B0302-0300