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SH7052 Scheda tecnica(PDF) 123 Page - Renesas Technology Corp |
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SH7052 Scheda tecnica(HTML) 123 Page - Renesas Technology Corp |
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123 / 919 page  97 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. |
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