HD6417011VX20V Renesas Electronics America, HD6417011VX20V Datasheet - Page 97
HD6417011VX20V
Manufacturer Part Number
HD6417011VX20V
Description
MPU 5V 0K 100-QFP
Manufacturer
Renesas Electronics America
Series
SuperH® SH7010r
Datasheet
1.HD6417011VX20V.pdf
(294 pages)
Specifications of HD6417011VX20V
Core Processor
SH-2
Core Size
32-Bit
Speed
20MHz
Connectivity
EBI/EMI, SCI
Peripherals
POR, PWM
Number Of I /o
11
Program Memory Type
ROMless
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Data Converters
A/D 7x10b
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
-
Program Memory Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
HD6417011VX20V
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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7.4
When a read from a slow device is completed, data buffers may not go off in time to prevent data
conflicts with the next access. If there is a data conflict during memory access, the problem can be
solved by inserting a wait in the access cycle.
To enable detection of bus cycle starts, waits can be inserted between access cycles during
continuous accesses of the same CS space by negating the CSn signal once.
7.4.1
For the two cases of write cycles after read cycles, and read cycles for a different area after read
cycles, waits are inserted so that the number of idle cycles specified by the IW31 to IW00 bits of
the BCR2. When idle cycles already exist between access cycles, only the number of empty cycles
remaining beyond the specified number of idle cycles are inserted.
Figure 7.7 shows an example of idles between cycles. In this example, 1 idle between CSn space
cycles has been specified, so when a CSm space write immediately follows a CSn space read
cycle, 1 idle cycle is inserted.
86
Address
CSm
Data
WRx
CSn
RD
CK
Waits between Access Cycles
Prevention of Data Bus Conflicts
CSn space read
T
1
Figure 7.7 Idle Cycle Insertion Example
T
2
Idle cycle
T
idle
CSm space write
T
1
T
2
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