HD6477021X20V Renesas Electronics America, HD6477021X20V Datasheet - Page 215
HD6477021X20V
Manufacturer Part Number
HD6477021X20V
Description
MCU 5V 32K PB-FREE 100-TQFP
Manufacturer
Renesas Electronics America
Series
SuperH® SH7020r
Datasheet
1.HD6417020SVX12IV.pdf
(511 pages)
Specifications of HD6477021X20V
Core Processor
SH-1
Core Size
32-Bit
Speed
20MHz
Connectivity
EBI/EMI, SCI
Peripherals
DMA, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
32KB (32K x 8)
Program Memory Type
OTP
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
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
-
Data Converters
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
HD6477021X20V
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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• Burst Mode
Relationship between Request Modes and Bus Modes by DMA Transfer Category: Table 9.6
shows the relationship between request modes and bus modes by DMA transfer category.
196 RENESAS
Figure 9.10 Transfer Example in the Cycle-Steal Mode (Dual address mode, DREQ level
Bus cycle
Once the bus right is obtained, the transfer is performed continuously until the transfer end
condition is satisfied. In the 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
bus cycle of the DMAC that currently has an acknowledged request ends, even if the transfer
end conditions have not been satisfied.
The burst mode cannot be used when the serial communications interface (SCI) is the transfer
request source. Figure 9.11 shows an example of DMA transfer timing in the burst mode. The
transfer conditions shown in the figure are:
Figure 9.11 Transfer Example in the Burst Mode (Single address mode, DREQ level
Bus cycle
DREQ
Single address mode
DREQ level detection
DREQ
CPU
CPU
CPU
CPU
CPU
CPU
DMAC DMAC DMAC DMAC DMAC
DMAC DMAC
Read
detection)
detection)
Bus right returned to CPU
Write
CPU
DMAC DMAC
Read
Write
DMAC
CPU
CPU
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