Hardware manual

Microcomputer Technical Q&A
91
Q&A No.: QAH8S-217
Category: DTC
Subject: Use of DTC Interrupt Select Bit (DISEL)
Question
How is the DISEL bit in DTC mode register B (MRB) used?
Answer
The use of the DISEL bit is shown below.
DISEL Description
0 The CPU executes interrupt handling (end processing or activation processing) after
completion of the specified number of data transfers. Suitable when performing data
transfer only.
1 The CPU executes interrupt handling at the end of (end processing or activation
processing) at the end of each DTC data transfer. If interrupt handling by the CPU is
necessary each time, high-speed execution is possible by having the DTC replace the
data transfer section.
Applicable Products
Applicability Series Applicability Series Applicability Series
Entire H8S Series Yes H8S/2655 Yes H8S/2350
Yes H8S/2355 Yes H8S/2357 Yes H8S/2345
Yes H8S/2245 Yes H8S/2148 H8S/2144
Yes H8S/2138 H8S/2134 Yes H8S/2128
H8S/2124 — — — —