HD6417709SF133B Renesas Electronics America, HD6417709SF133B Datasheet - Page 406

• Manufacturer Part Number: HD6417709SF133B
• Description: IC SUPERH MPU ROMLESS 208LQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417709SF133B

• Core Processor: SH-3
• Core Size: 32-Bit
• Speed: 133MHz
• Connectivity: EBI/EMI, FIFO, IrDA, SCI, SmartCard
• Peripherals: DMA, POR, WDT
• Number Of I /o: 96
• Program Memory Type: ROMless
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 2.05 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 208-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -

Rev. 5.00, 09/03, page 360 of 760
Bus cycle
Bus cycle
Burst Mode
Once the bus is obtained, the transfer is performed continuously until the transfer end
condition is satisfied. In external request mode with low level detection of the DREQ pin,
however, when the DREQ pin is driven high, the bus passes to the other bus master after the
DMAC transfer request that has already been accepted ends, even if the transfer end conditions
have not been satisfied.
Burst mode cannot be used when a serial communication interface (IrDA, SCI), or A/D
converter is the transfer request source. Figure 11.13 shows an example of burst mode timing.
DREQ
DREQ
CPU
CPU
Figure 11.12 Example of DMA Transfer in Cycle-Steal Mode
Figure 11.13 Example of Transfer in Burst Mode
CPU
CPU
CPU
CPU
DMAC DMAC DMAC
DMAC DMAC
Read
Read
Write
Write
Bus returned to CPU
Read
CPU DMAC DMAC CPU
DMAC DMAC
Read
Write
Read
Write
DMAC
Write
CPU
CPU