h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 151

• Manufacturer Part Number: h8s-2158
• 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 of interrupt requests that can be used to activate the DTC, see section 7, Data Transfer
Controller (DTC). Figure 5.9 shows a block diagram of the DTC and interrupt controller.
The interrupt controller has three main functions in DTC control.
Selection of Interrupt Source: It is possible to select DTC activation request or CPU interrupt
request with the DTCE bit of DTCERA to DTCERE 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.
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 7.4, Location of Register
Information and DTC Vector Table, for the respective priorities.
Interrupt request to CPU
Activation request to DTC
Both of the above
peripheral
interrupt
On-chip
module
IRQ
DTC Activation by Interrupt
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
Control logic
priority
Rev. 3.00 Jan 25, 2006 page 99 of 872
Section 5 Interrupt Controller
CPU interrupt
request vector
number
DTC activation
request vector
number
Clear signal
I, UI
REJ09B0286-0300
CPU
DTC