HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 211
HD6412240
Manufacturer Part Number
HD6412240
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6412240.pdf
(818 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
HD6412240FA13
Manufacturer:
HITACHI
Quantity:
8 831
Part Number:
HD6412240FA13V
Manufacturer:
HITACHI/日立
Quantity:
20 000
Company:
Part Number:
HD6412240FA20
Manufacturer:
HITACHI
Quantity:
12 388
Company:
Part Number:
HD6412240FA20V
Manufacturer:
LT
Quantity:
3 220
Part Number:
HD6412240FA20V
Manufacturer:
RENESAS/瑞萨
Quantity:
20 000
Company:
Part Number:
HD6412240TE13
Manufacturer:
Renesas Electronics America
Quantity:
10 000
Company:
Part Number:
HD6412240TE13V
Manufacturer:
RENESAS
Quantity:
15 090
Part Number:
HD6412240TE13V
Manufacturer:
RENESAS/瑞萨
Quantity:
20 000
- Current page: 211 of 818
- Download datasheet (4Mb)
6.7
6.7.1
When the H8S/2245 Group accesses external space, it can insert a 1-state idle cycle (T
bus cycles in the following two cases: (1) when read accesses between different areas occur
consecutively, and (2) 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, I/O interfaces, and so on.
(1) Consecutive Reads between Different Areas
If consecutive reads between different areas occur while the ICIS1 bit in BCRH is set to 1, an idle
cycle is inserted at the start of the second read cycle. This is enabled in advanced mode.
Figure 6.20 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.
Address bus
CS (area A)
CS (area B)
Data bus
RD
Idle Cycle
Operation
(a) Idle cycle not inserted
T
1
Bus cycle A
(ICIS1 = 0)
T
Figure 6.20 Example of Idle Cycle Operation (1)
2
T
Long output
floating time
3
Bus cycle B
T
1
T
2
Data
collision
Address bus
CS (area A)
CS (area B)
Data bus
Rev.3.00 Mar. 26, 2007 Page 169 of 772
RD
T
1
(b) Idle cycle inserted
Bus cycle A
(Initial value ICIS1 = 1)
T
2
Section 6 Bus Controller
T
3
REJ09B0355-0300
T
Bus cycle B
I
I
) between
T
1
T
2
Related parts for HD6412240
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Renesas Technology Corp [Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series]
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
Part Number:
Description:
Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series
Manufacturer:
RENESAS [Renesas Technology Corp]
Datasheet:
Part Number:
Description:
Renesas 16-Bit Single-Chip Microcomputer Renesas H8S Family/H8S/2100 Series
Manufacturer:
RENESAS [Renesas Technology Corp]
Datasheet:
Part Number:
Description:
Renesas MCU
Manufacturer:
RENESAS [Renesas Technology Corp]
Datasheet:
Part Number:
Description:
RENESAS MCU
Manufacturer:
RENESAS [Renesas Technology Corp]
Datasheet:
Part Number:
Description:
RENESAS MCU
Manufacturer:
RENESAS [Renesas Technology Corp]
Datasheet:
Part Number:
Description:
RENESAS MCU
Manufacturer:
RENESAS [Renesas Technology Corp]
Datasheet:
Part Number:
Description:
Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
Manufacturer:
RENESAS [Renesas Technology Corp]
Datasheet:
Part Number:
Description:
Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
Manufacturer:
RENESAS [Renesas Technology Corp]
Datasheet:
Part Number:
Description:
Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
Manufacturer:
RENESAS [Renesas Technology Corp]
Datasheet:
Part Number:
Description:
Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
Manufacturer:
RENESAS [Renesas Technology Corp]
Datasheet:
Part Number:
Description:
Renesas 32-Bit Single-Chip RISC Microprocessor SuperH RISC engine Family/SH7040 Series(CPU Core SH-2)
Manufacturer:
RENESAS [Renesas Technology Corp]
Datasheet:
Part Number:
Description:
Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
Manufacturer:
RENESAS [Renesas Technology Corp]
Datasheet:
Part Number:
Description:
Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family / SH7641 Series
Manufacturer:
RENESAS [Renesas Technology Corp]
Datasheet:
Part Number:
Description:
Renesas 32-Bit RISC Microcomputer
Manufacturer:
RENESAS [Renesas Technology Corp]
Datasheet: