E62655RUSB Renesas Electronics America, E62655RUSB Datasheet - Page 338

• Manufacturer Part Number: E62655RUSB
• Description: EMULATOR BASE H8S/2655R W/USB
• Manufacturer: Renesas Electronics America
• Type: Microcontrollerr

Specifications of E62655RUSB

• Contents: E6000 Emulator Unit and 4 Logic Probes
• For Use With/related Products: H8S/2655R
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Section 7 DMA Controller
Activation Source Acceptance
At the start of activation source acceptance, a low level is detected in both DREQ pin falling edge
sensing and low level sensing. Similarly, in the case of an internal interrupt, the interrupt request is
detected. Therefore, a request is accepted from an internal interrupt or DREQ pin low level that
occurs before execution of the DMABCRL write to enable transfer.
When the DMAC is activated, take any necessary steps to prevent an internal interrupt or DREQ
pin low level remaining from the end of the previous transfer, etc.
Internal Interrupt after End of Transfer
When the DTE bit is cleared to 0 by the end of transfer or an abort, the selected internal interrupt
request will be sent to the CPU or DTC even if DTA is set to 1.
Also, if internal DMAC activation has already been initiated when operation is aborted, the
transfer is executed but flag clearing is not performed for the selected internal interrupt even if
DTA is set to 1.
An internal interrupt request following the end of transfer or an abort should be handled by the
CPU as necessary.
Channel Re-Setting
To reactivate a number of channels when multiple channels are enabled, use exclusive handling of
transfer end interrupts, and perform DMABCR control bit operations exclusively.
Note, in particular, that in cases where multiple interrupts are generated between reading and
writing of DMABCR, and a DMABCR operation is performed during new interrupt handling, the
DMABCR write data in the original interrupt handling routine will be incorrect, and the write may
invalidate the results of the operations by the multiple interrupts. Ensure that overlapping
DMABCR operations are not performed by multiple interrupts, and that there is no separation
between read and write operations by the use of a bit-manipulation instruction.
Also, when the DTE and DTME bits are cleared by the DMAC or are written with 0, they must
first be read while cleared to 0 before the CPU can write a 1 to them.
Rev. 5.00 Sep 14, 2006 page 308 of 1060
REJ09B0331-0500