R4F24269NVFQV Renesas Electronics America, R4F24269NVFQV Datasheet - Page 314

• Manufacturer Part Number: R4F24269NVFQV
• Description: MCU 256KB FLASH 64K 144-LQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2400r

Specifications of R4F24269NVFQV

• Core Processor: H8S/2600
• Core Size: 16/32-Bit
• Speed: 33MHz
• Connectivity: EBI/EMI, I²C, IrDA, SCI, SSU, UART/USART
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 96
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 64K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 10x10b, D/A 2x8b
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 144-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Section 6 Bus Controller (BSC)
6.10
6.10.1
When this LSI accesses external address space, it can insert an idle cycle (T
in the following three cases: (1) when read accesses in different areas occur consecutively, (2)
when a write cycle occurs immediately after a read cycle, and (3) when a read cycle occurs
immediately after a write cycle. Insertion of a 1-state or 2-state idle cycle can be selected with the
IDLC bit in BCR. By inserting an idle cycle it is possible, for example, to avoid data collisions
between ROM, etc., with a long output floating time, and high-speed memory, I/O interfaces, and
so on.
(1)
If consecutive reads in 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 6.77 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 read cycle for SRAM, each
being located in a different area. In (a), an idle cycle is not inserted, and a collision occurs in bus
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.
Page 284 of 1372
Consecutive Reads in Different Areas
CS (area A)
CS (area B)
Address bus
Idle Cycle
Operation
Data bus
RD
φ
(a) No idle cycle insertion
(ICIS1 = 0)
T
1
Bus cycle A
Long output floating time
Figure 6.77 Example of Idle Cycle Operation
T
2
(Consecutive Reads in Different Areas)
T
3
Bus cycle B
T
1
T
2
Data collision
Address bus
CS (area A)
CS (area B)
Data bus
RD
φ
T
1
Bus cycle A
(b) Idle cycle insertion
H8S/2426, H8S/2426R, H8S/2424 Group
(ICIS1 = 1, initial value)
T
2
T
3
Idle cycle
i
REJ09B0466-0350 Rev. 3.50
) between bus cycles
T
Bus cycle B
i
T
1
T
2
Jul 09, 2010