h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 225

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

7.3.2
The DTC operates when activated by an interrupt or by a write to DTVECR by software (software
activation). An interrupt request can be directed to the CPU or DTC, as designated by the
corresponding DTCER bit. The interrupt request is directed to the DTC when the corresponding
bit is set to 1, and to the CPU when the bit is cleared to 0.
At the end of one data transfer (or the last of the consecutive transfers in the case of chain transfer)
the interrupt source or the corresponding DTCER bit is cleared. Table 7.3 shows activation
sources and DTCER clearing.
The interrupt source flag for RXI0, for example, is the RDRF flag in SCI0.
Table 7.3
Figure 7.3 shows a block diagram of activation source control. For details see section 5, Interrupt
Controller.
Activation
Source
Software
activation
Interrupt
activation
Activation Sources
Activation Sources and DTCER Clearing
When DISEL Bit Is 0 and
Specified Number of Transfers
Have Not Ended
SWDTE bit cleared to 0
Corresponding DTCER bit held
at 1
Activation source flag cleared
to 0
Section 7 Data Transfer Controller [H8S/2138 Group]
When DISEL Bit Is 1 or
Specified Number of Transfers
Have Ended
Rev. 4.00 Jun 06, 2006 page 171 of 1004
SWDTE bit held at 1
Interrupt request sent to CPU
Corresponding DTCER bit cleared to 0
Activation source flag held at 1
Activation source interrupt request
sent to CPU
REJ09B0301-0400