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Section 5 Interrupt Controller
5.6.5
DTC Activation by Interrupt
The DTC can be activated by an interrupt. In this case, the following options are available:
• Interrupt request to CPU
• Activation request to DTC
• Both of the above
For details of interrupt requests that can be used to activate the DTC, see section 7, Data Transfer
Controller (DTC). Figure 5.8 shows a block diagram of the DTC and interrupt controller.
IRQ
interrupt
Interrupt source
On-chip
clear signal
peripheral
module
The interrupt controller has three main functions in DTC control.
(1)
Selection of Interrupt Source
It is possible to select DTC activation request or CPU interrupt request with the DTCE bit of
DTCERA to DTCERF in the DTC. After a DTC data transfer, the DTCE bit can be cleared to 0
and an interrupt request sent to the CPU in accordance with the specification of the DISEL bit of
MRB in the DTC. When the DTC performs the specified number of data transfers and the transfer
counter reaches 0, following the DTC data transfer the DTCE bit is cleared to 0 and an interrupt
request is sent to the CPU.
Rev. 1.00 Mar. 12, 2008 Page 100 of 1178
REJ09B0403-0100
Interrupt
request
Selection
circuit
Select
signal
DTCER
DTVECR
clear signal
Interrupt controller
Figure 5.8 Interrupt Control for DTC
Control logic
Clear signal
SWDTE
Determination of
priority
DTC activation
request vector
number
DTC
Clear signal
CPU interrupt
request vector
number
CPU
I, UI
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