Hardware manual

Microcomputer Technical Q&A
72
Q&A No.: QAH8S-202
Category: DMAC
Subject: Maximum Transfer Rate
Question
What is the maximum transfer rate for single address transfer?
Answer
Two states are required for the DMAC activation wait, and two states for a two-word data transfer.
Thus, at 20 MHz operation, the maximum transfer rate is 16 bits / (2t
cyc
+ 2t
cyc
) × 50 ns = 10
Mbytes/s.
Applicable Products
Applicability Series Applicability Series Applicability Series
Entire H8S Series Yes H8S/2655 Yes H8S/2350
H8S/2355 Yes H8S/2357 H8S/2345
H8S/2245 H8S/2148 H8S/2144
H8S/2138 H8S/2134 H8S/2128
H8S/2124 — — — —