D12674RVFQ33D Renesas Electronics America, D12674RVFQ33D Datasheet - Page 285

• Manufacturer Part Number: D12674RVFQ33D
• Description: MCU 3V 0K I-TEMP 144-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2600r

Specifications of D12674RVFQ33D

• 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 Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 12x10b; D/A 4x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 144-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Other names: HD6412674RVFQ33D; HD6412674RVFQ33D

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