DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 170
![IC H8S/2437 MCU FLASH 128QFP](/photos/12/29/122945/df2437fv_sml.jpg)
DF2437FV
Manufacturer Part Number
DF2437FV
Description
IC H8S/2437 MCU FLASH 128QFP
Manufacturer
Renesas Electronics America
Series
H8® H8S/2400r
Specifications of DF2437FV
Core Processor
H8S/2600
Core Size
16-Bit
Speed
20MHz
Connectivity
I²C, SCI
Peripherals
POR, PWM, WDT
Number Of I /o
85
Program Memory Size
256KB (256K x 8)
Program Memory Type
FLASH
Ram Size
16K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Data Converters
A/D 16x10b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
128-QFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DF2437FV
Manufacturer:
Renesas Electronics America
Quantity:
10 000
- Current page: 170 of 776
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6.6
When this LSI accesses the external address space, it can insert a 1-state idle cycle (T
bus cycles when a write cycle occurs immediately after a read cycle. By inserting an idle cycle it is
possible, for example, to avoid data collisions between ROM with a long output floating time, and
high-speed memory and I/O interfaces.
In the case of normal extended mode if an external write occurs after an external read while the
ICIS bit is set to 1 in BCR, an idle cycle is inserted at the start of the write cycle.
In the case of multiplex extended mode if an external cycle occurs after an external read while the
ICIS bit is set to 1 in BCR, an idle cycle is inserted at the start of the external cycle after the
external read.
Figure 6.27 shows examples of idle cycle operation. In these examples, bus cycle A is a read cycle
for ROM with a long output floating time, and bus cycle B is a CPU write cycle. In figure 6.27 (a),
with no idle cycle inserted, a conflict occurs in bus cycle B between the read data from ROM and
the CPU write data. In figure 6.27 (b), an idle cycle is inserted, thus preventing data conflict.
Rev.2.00 May. 28, 2009 Page 130 of 732
REJ09B0059-0200
Address bus
Idle Cycle
Data bus
φ
(a) No idle cycle insertion
T
1
Bus cycle A
Long output floating time
Figure 6.27 Examples of Idle Cycle Operation
T
2
T
3
Bus cycle B
T
1
T
2
Data conflict
Address bus
Data bus
φ
T
1
Bus cycle A
T
(b) Idle cycle insertion
2
T
3
T
I
Bus cycle B
T
1
I
) between
T
2
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