D13007VX13V Renesas Electronics America, D13007VX13V Datasheet - Page 208
D13007VX13V
Manufacturer Part Number
D13007VX13V
Description
MCU 3V 0K 100-TQFP
Manufacturer
Renesas Electronics America
Series
H8® H8/300Hr
Specifications of D13007VX13V
Core Processor
H8/300H
Core Size
16-Bit
Speed
13MHz
Connectivity
SCI, SmartCard
Peripherals
DMA, PWM, WDT
Number Of I /o
35
Program Memory Type
ROMless
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b; D/A 2x8b
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
-
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6. Bus Controller
6.9
6.9.1
When the H8/3006 and H8/3007 chip accesses external space, it can insert a 1-state idle cycle (T
between bus cycles in the following cases: (1) when read accesses between different areas occur
consecutively, (2) when a write cycle occurs immediately after a read cycle, and (3) when external
address space other than DRAM space is accessed immediately after a DRAM space access. By
inserting an idle cycle it is possible, for example, to avoid data collisions between ROM, which
has a long output floating time, and high-speed memory, I/O interfaces, and so on.
The ICIS1 and ICIS0 bits in BCR both have an initial value of 1, so that an idle cycle is inserted in
the initial state. If there are no data collisions, the ICIS bits can be cleared.
Consecutive Reads between Different Areas: If consecutive reads between different areas occur
while the ICIS1 bit is set to 1 in BCR, an idle cycle is inserted at the start of the second read cycle.
Figure 6.41 shows an example of the operation in this case. In this example, bus cycle A is a read
cycle from ROM with a long output floating time, and bus cycle B is a read cycle from SRAM,
each being located in a different area. In (a), an idle cycle is not inserted, and a collision occurs in
cycle B between the read data from ROM and that from SRAM. In (b), an idle cycle is inserted,
and a data collision is prevented.
Write after Read: If an external write occurs after an external read while the ICIS0 bit is set to 1
in BCR, an idle cycle is inserted at the start of the write cycle.
Figure 6.42 shows an example of the operation in this case. In this example, bus cycle A is a read
cycle from ROM with a long output floating time, and bus cycle B is a CPU write cycle.
Rev.5.00 Sep. 12, 2007 Page 178 of 764
REJ09B0396-0500
Address bus
Data bus
Idle Cycle
Operation
RD
φ
(a) Idle cycle not inserted
Figure 6.41 Example of Idle Cycle Operation (1) (ICIS1 = 1)
Bus cycle A Bus cycle B
T
1
Long buffer-off time
T
2
T
3
T
1
T
2
Data collision
Address bus
Data bus
RD
φ
Bus cycle A Bus cycle B
T
(b) Idle cycle inserted
1
T
2
T
3
T
i
T
1
T
2
I
)
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