HD6417020SVX12IV Renesas Electronics America, HD6417020SVX12IV Datasheet - Page 229
HD6417020SVX12IV
Manufacturer Part Number
HD6417020SVX12IV
Description
MCU 3/5V 0K PB-FREE 100-TQFP
Manufacturer
Renesas Electronics America
Series
SuperH® SH7020r
Datasheet
1.HD6417020SVX12IV.pdf
(511 pages)
Specifications of HD6417020SVX12IV
Core Processor
SH-1
Core Size
32-Bit
Speed
12.5MHz
Connectivity
EBI/EMI, SCI
Peripherals
DMA, POR, PWM, WDT
Number Of I /o
32
Program Memory Type
ROMless
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
100-TQFP, 100-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Program Memory Size
-
Data Converters
-
Available stocks
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• Countermeasure
210 RENESAS
Especially as shown in Figure 9.17, if the bus cycle of DMA is a full access to DRAM or if
refresh demand is generated, sampling of DREQ takes place before DACK is output as
mentioned above. This phenomenon is found when one of the following transfers is made with
DREQ set to the level detection in the DMA cycle steal mode, in a system which employs
DRAM (refresh enabled).
To prevent unnecessary DMA transfers, configure the system where DREQ is used for edge
detection and the edge corresponding to the next transfer request occurs after the DACK
output.
DACK
Transfer from a device having DACK to memory in the single address mode (not
restricted to DRAM)
Transfer from DRAM to a device having DACK in the single address mode
Output at DACK write in the dual address mode
Output at DACK read in the dual address mode and DMA transfer using DRAM as a
source
CK
Figure 9.17 Example of DREQ Sampling before Output of DACK
Bus cycle of DRAM
Tp
Sampling point
(Full access)
Tr
Number of states of
Tc
: Bus cycle of DMAC
Figure 9.16 Sampling Points of DREQ
DMAC bus cycle
Refresh
1
2
3
4
Sampling point
When refresh operation is entered
Sampling point of DREQ for DACK output position
differs with presence/absence of the refresh operation.
T1
T2
Sampling point
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