R0K561622S000BE Renesas Electronics America, R0K561622S000BE Datasheet - Page 282
R0K561622S000BE
Manufacturer Part Number
R0K561622S000BE
Description
KIT STARTER FOR H8SX/1622
Manufacturer
Renesas Electronics America
Series
Renesas Starter Kits (RSK)r
Type
MCUr
Specifications of R0K561622S000BE
Contents
Board, Cables, CD, Debugger, Power Supply
Silicon Manufacturer
Renesas
Features
Coding And Debugging, E10A Emulator, RS232 Serial Connection
Kit Contents
Board
Silicon Family Name
H8SX/1622F
Silicon Core Number
R5F61622N50LGV
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
H8SX/1622
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
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Section 8 Bus Controller (BSC)
8.13
8.13.1
This LSI has a write data buffer function for the external data bus. Using the write data buffer
function enables internal accesses in parallel with external writes or DMAC single address
transfers. The write data buffer function is made available by setting the WDBE bit to 1 in BCR1.
Figure 8.44 shows an example of the timing when the write data buffer function is used. When this
function is used, if an external address space write or a DMAC single address transfer continues
for two cycles or longer, and there is an internal access next, an external write only is executed in
the first two cycles. However, from the next cycle onward, internal accesses (on-chip memory or
internal I/O register read/write) and the external address space write rather than waiting until it
ends are executed in parallel.
Rev. 2.00 Sep. 16, 2009 Page 252 of 1036
REJ09B0414-0200
External
space
write
Figure 8.44 Example of Timing when Write Data Buffer Function is Used
Write Data Buffer Function
Write Data Buffer Function for External Data Bus
Iφ
Internal
address bus
Bφ
A23 to A0
CSn
LHWR, LLWR
D15 to D0
T
1
External write cycle
On-chip
memory 1
On-chip memory read
External address
T
2
memory 2
On-chip
Peripheral module address
Peripheral module read
T
3
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