h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 232
![no-image](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__sml.jpg)
h8s-2172
Manufacturer Part Number
h8s-2172
Description
Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2172.pdf
(570 pages)
- Current page: 232 of 570
- Download datasheet (5Mb)
DREQ Pin Low Level Activation Timing: Figure 7.31 shows an example of single address mode
transfer activated by the DREQ pin low level.
DREQ pin sampling is performed in each cycle starting at the next rise of φ after the end of the
DMMDR write cycle for setting the transfer-enabled state.
When a low level is sampled at the DREQ pin while acceptance via the DREQ pin is possible, the
request is held within the DMAC. Then when activation is initiated within the DMAC, the request
is cleared. At the end of the single cycle, acceptance resumes and DREQ pin low level sampling is
performed again; this sequence of operations is repeated until the end of the transfer.
Rev. 2.00, 03/04, page 200 of 534
[1]
[2], [5] Request is cleared at end of next bus cycle, and activation is started in DMAC.
[3], [6] DMA cycle is started.
[4], [7] Acceptance is resumed after completion of single cycle.
Figure 7.31 Example of Single Address Mode Transfer Activated by DREQ Pin Low Level
Acceptance after transfer enabling;
(As in [1],
φ
Address bus
DMA control
Channel
Idle
pin low level is sampled at rise of φ, and request is held.)
[1]
Minimum 3 cycles
Request
Bus release
[2]
clearance period
Single
[3]
Request
DMA single
Transfer source/
destination
Idle
pin low level is sampled at rise of φ, and request is held.
Acceptance
resumed
[4]
Minimum 3 cycles
Request
Bus release
[5]
clearance period
Single
[6]
Request
DMA single Bus release
Transfer source/
destination
Idle
Acceptance
resumed
[7]
Related parts for h8s-2172
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![h8s-2138](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
![h8s-2169](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
![h8s-2161b](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
![h8s-2110b](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
![h8s-2111b](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Renesas 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
![h8s-2158](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
![h8s-2635](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
![h8s-2649](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
![h8s-2646](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
![h8s-2628](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
![HD6417709S](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Renesas Technology Corp [Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series]
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
![M30291FCTHP](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
RENESAS MCU M16C FAMILY / M16C/Tiny SERIES
Manufacturer:
Renesas Electronics Corporation.
Datasheet:
![R0K505210S000BE](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
Renesas Starter Kit for RX210
Manufacturer:
Renesas Electronics Corporation.
![R0K505630S000BE](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
EVALBOARD/Renesas StarterKit for RX630
Manufacturer:
Renesas Electronics Corporation.
![R0K50563NS000BE](/images/manufacturer_photos/0/5/561/renesas_electronics_corporation__tmb.jpg)
Part Number:
Description:
EVALBOARD/Renesas Starter Kit+ for RX63N
Manufacturer:
Renesas Electronics Corporation.