h8s-2161b Renesas Electronics Corporation., h8s-2161b Datasheet - Page 167

• Manufacturer Part Number: h8s-2161b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

5.6.5
The DTC can be activated by an interrupt. In this case, the following options are available:
For details on 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.
Selection of Interrupt Source: Interrupt factors are selected as DTC activation source or CPU
interrupt source by the DTCE bit of DTCERA to DTCERE 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 an interrupt is requested to the CPU.
On-chip
supporting
module
Interrupt request to CPU
Activation request to DTC
Selection of a number of the above
IRQ
interrupt
DTC Activation by Interrupt
Interrupt source
clear signal
Interrupt
request
Figure 5.8 DTC and Interrupt Controller
Interrupt controller
Selection
DTVECR
DTCER
circuit
Select
signal
clear signal
Clear signal
SWDTE
Determination of
Control logic
Rev. 3.00 Mar 21, 2006 page 113 of 788
priority
Section 5 Interrupt Controller
DTC activation
request vector
number
CPU interrupt
request vector
number
Clear signal
I, UI
REJ09B0300-0300
CPU
DTC