HD64F2676VFC33 Renesas Electronics America, HD64F2676VFC33 Datasheet - Page 285
HD64F2676VFC33
Manufacturer Part Number
HD64F2676VFC33
Description
IC H8S MCU FLASH 256K 144-QFP
Manufacturer
Renesas Electronics America
Series
H8® H8S/2600r
Specifications of HD64F2676VFC33
Core Processor
H8S/2600
Core Size
16-Bit
Speed
33MHz
Connectivity
IrDA, SCI
Peripherals
DMA, POR, PWM, WDT
Number Of I /o
103
Program Memory Size
256KB (256K x 8)
Program Memory Type
FLASH
Ram Size
8K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Data Converters
A/D 12x10b; D/A 4x8b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
144-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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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 6.66 shows an example of the operation in this case. In this example, 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 (a), an
idle cycle is not inserted, and a collision occurs in bus cycle B between the read data from ROM
and the CPU write data. In (b), an idle cycle is inserted, and a data collision is prevented.
Read after Write: If an external read occurs after an external write while the ICIS2 bit is set to 1
in BCR, an idle cycle is inserted at the start of the read cycle.
Figure 6.67 shows an example of the operation in this case. In this example, bus cycle A is a CPU
write cycle and bus cycle B is a read cycle from an external device. In (a), an idle cycle is not
inserted, and a collision occurs in bus cycle B between the CPU write data and read data from an
external device. In (b), an idle cycle is inserted, and a data collision is prevented.
Note: In the H8S/2678 Group, an idle cycle cannot be inserted in the condition (3).
Address bus
CS (area A)
CS (area B)
Data bus
HWR
Figure 6.66 Example of Idle Cycle Operation (Write after Read)
RD
(a) No idle cycle insertion
T
(ICIS0 = 0)
1
Bus cycle A
Long output floating time
T
2
T
3
Bus cycle B
T
1
T
2
Data collision
Address bus
CS (area A)
CS (area B)
Data bus
HWR
RD
Rev. 3.00 Mar 17, 2006 page 233 of 926
T
(b) Idle cycle insertion
1
Bus cycle A
(ICIS0 = 1, initial value)
T
Section 6 Bus Controller (BSC)
2
T
3
Idle cycle
T
i
Bus cycle B
REJ09B0283-0300
T
1
T
2
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