SH7052 datasheet(123/919 Pages) RENESAS

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6.6

Data Transfer with Interrupt Request Signals

The following data transfer can be carried out using interrupt request signals:

• Activate DMAC only, without generating CPU interrupt

Among interrupt sources, those designated as DMAC activating sources are masked and not input

to the INTC. The masking condition is as follows:

Mask condition = DME · (DE0 · source selection 0 + DE1 · source selection 1 + DE2 ·

source selection 2 + DE3 · source selection 3)

6.6.1

Handling CPU Interrupt Sources, but Not DMAC Activating Sources

1. Either do not select the DMAC as a source, or clear the DME bit to 0.

2. Activating sources are applied to the CPU when interrupts occur.

3. The CPU clears interrupt sources with its interrupt processing routine and performs the

necessary processing.

6.6.2

Handling DMAC Activating Sources but Not CPU Interrupt Sources

1. Select the DMAC as a source and set the DME bit to 1. CPU interrupt sources are masked

regardless of the interrupt priority level register settings.

2. Activating sources are applied to the DMAC when interrupts occur.

3. The DMAC clears activating sources at the time of data transfer.

SH7052 Datasheet(PDF) 123 Page - Renesas Technology Corp