DMAC
9.2 DMAC Related Registers
9
9.2.6 DMA Interrupt Related Registers
The DMA interrupt related registers are used to control the interrupt request signals sent from the DMAC to the
Interrupt Controller.
(1) Interrupt request status bit
This status bit is used to determine whether there is an interrupt request. When an interrupt request occurs,
this bit is set in hardware (cannot be set in software). The status bit is cleared by writing "0". Writing "1" has
no effect; the bit retains the status it had before the write. Because this status bit is unaffected by the interrupt
request mask bit, it can be used to inspect the operating status of peripheral functions.
In interrupt handling, make sure that within the grouped interrupt request status, only the status bit for the
interrupt request that has been serviced is cleared. If the status bit for any interrupt request that has not been
serviced is cleared, the pending interrupt request is cleared simultaneously with its status bit.
(2) Interrupt request mask bit
This bit is used to disable unnecessary interrupt requests within the grouped interrupt request. Set this bit to "0" to
enable interrupt requests or "1" to disable interrupt requests.
Group interrupt
Interrupt request from
each peripheral function
Set
Interrupt request status
Data = 0
clear
Data bus
F/F
To the Interrupt
Controller
F/F
Interrupt request enabled
Figure 9.2.2 Interrupt Request Status and Mask Registers
32180 Group User’s Manual (Rev.1.0)
9-22
RENESAS [ RENESAS TECHNOLOGY CORP ]
