HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 232

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 7 Data Transfer Controller
DTCER clearance. The activation source flag, in the case of RXI0, for example, is the RDRF flag
of SCI0. As there are a number of activation sources, the activation source flag is not cleared with
the last byte (or word) transfer. Take appropriate measures at each interrupt.
Table 7.3
Activation Source
Software activation The SWDTE bit is cleared to 0
Interrupt activation
Figure 7.3 shows a block diagram of activation source control. For details see section 5, Interrupt
Controller.
Rev.3.00 Mar. 26, 2007 Page 190 of 772
REJ09B0355-0300
Source flag cleared
IRQ interrupt
supporting
DTVECR
On-chip
module
Activation Source and DTCER Clearance
Figure 7.3 Block Diagram of DTC Activation Source Control
Interrupt
request
When the DISEL Bit Is 0 and
the Specified Number of
Transfers Have Not Ended
The corresponding DTCER bit
remains set to 1
The activation source flag is
cleared to 0
DTCER
Select
Clear
Interrupt controller
controller
When the DISEL Bit Is 1, or when
the Specified Number of Transfers
Have Ended
The SWDTE bit remains set to 1
An interrupt request is issued to the CPU
The corresponding DTCER bit is cleared
to 0
The activation source flag remains set to 1
A request is issued to the CPU for the
activation source interrupt
Clear
DTC
Clear request
Interrupt mask
CPU