SH7050 Datasheet, PDF (114/841 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH RISC engine Family/

Section 6 Interrupt Controller (INTC)
interrupt source
Interrupt request flag
(generated by DMAC)
clear
DMAC
interrupt source (not designated as DMAC
activating sources)
interrupt request
Figure 6.6 Block Diagram of Interrupt Controller
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.
Rev. 5.00 Jan 06, 2006 page 94 of 818
REJ09B0273-0500