h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 151

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

5.6.2
Figure 5.9 shows a block diagram of the DTC interrupt controller.
5.6.3
The interrupt controller has three main functions in DTC control.
Selection of Interrupt Source: Interrupt factors are selected as DTC activation request or CPU
interrupt request by the DTCE bit of DTCERA to DTCERG, and DTCERI of DTC.
By specifying the DISEL bit of the DTC’s MRB, it is possible to clear the DTCE bit to 0 after
DTC data transfer, and request a CPU interrupt.
If DTC carries out the designate number of data transfers and the transfer counter reads 0, after
DTC data transfer, the DTCE bit is also cleared to 0, and a CPU interrupt requested.
Determination of Priority: The DTC activation source is selected in accordance with the default
priority order, and is not affected by mask or priority levels. See section 8.3.3, DTC Vector Table
for the respective priority.
On-chip
supporting
module
IRQ
interrupt
Block Diagram
Operation
Interrupt source
clear signal
Interrupt
request
Interrupt controller
Figure 5.9 Interrupt Control for DTC
Selection
DTVECR
DTCER
circuit
Select
signal
clear signal
Clear signal
SWDTE
Determination of
Rev. 5.00 Sep 22, 2005 page 125 of 1136
Control logic
priority
Section 5 Interrupt Controller
DTC activation
request vector
number
CPU interrupt
request vector
number
Clear signal
I, I2 to I0
REJ09B0257-0500
CPU
DTC