Dtc Activation By Interrupt; Figure 5.6 Interrupt Control For Dtc And Dmac - Hitachi H8S/2215 Series Hardware Manual

5.6.5

DTC Activation by Interrupt

The DTC and DMAC can be activated by an interrupt. In this case, the following options are
available:
• Interrupt request to CPU
• Activation request to DTC
• Activation request to DMAC
• Selection of a number of the above
For details of interrupt requests that can be used with to activate the DTC and DMAC, see section
8, Data Transfer Controller (DTC) and section 7, DMA Controller.
Figure 5.6 shows a block diagram of the interrupt controller of DTC and DMAC.
IRQ
interrupt
Interrupt source
On-chip
clear signal
supporting
module
Selection of Interrupt Source: An activation factor is directly input to each channel of the
DMAC. The activation factors for each channel of the DMAC are selected by the DTF3 to DTF0
bits of DMACR. The DTA bit of DMABCR can be used to select whether the selected activation
factors are managed by the DMAC. By setting the DTA bit to 1, the interrupt factor which was the
Interrupt
request
Selection
circuit
Select
signal
DTCER
DTVECR
Interrupt controller

Figure 5.6 Interrupt Control for DTC and DMAC

DMAC
Control logic
Clear signal
SWDTE
clear signal
Determination of
priority
DTC activation
request vector
number
Clear signal
CPU interrupt
request vector
number
I, I2 to I0
Rev. 3.0, 10/02, page 93 of 686
DTC
CPU