HD6417727F100V Renesas Electronics America, HD6417727F100V Datasheet - Page 470

• Manufacturer Part Number: HD6417727F100V
• Description: MPU 3V 16K PB-FREE 240-QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417727F100V

• Core Processor: SH-3 DSP
• Core Size: 32-Bit
• Speed: 100MHz
• Connectivity: FIFO, SCI, SIO, SmartCard, USB
• Peripherals: DMA, LCD, POR, WDT
• Number Of I /o: 104
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.6 V ~ 2.05 V
• Data Converters: A/D 6x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 240-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

Section 14 Direct Memory Access Controller (DMAC)
• Single Address Mode
The single address mode is used when transfer is performed between external devices including
external memories, one of which is accessed (selected) by the DACK signal and the other of
which is accessed by address. In this mode, the DMAC outputs the transfer request acknowledge
signal DACK to one external device, and simultaneously outputs an address to the other device;
thus DMA transfer is performed in one bus cycle. An example of transfer between an external
memory and an external device with DACK is shown in figure 14.11. The external device outputs
data to a data bus and the data is written to the external memory in a single bus cycle.
Two kinds of transfer are possible in single address mode: (1) transfer between an external device
with DACK and a memory-mapped external device, and (2) transfer between an external device
with DACK and an external memory. In both cases, only the external request signal (DREQ) is
used as a transfer request.
Figures 14.12 and 14.13 show examples of the DMA transfer timing in single address mode.
Rev.6.00 Mar. 27, 2009 Page 412 of 1036
REJ09B0254-0600
SH7727
Data flow
Figure 14.11 Data Flow in Single Address Mode
DMAC
External address bus
DACK
DREQ
External data bus
External device
with DACK
External
memory