Hardware manual

Microcomputer Technical Q&A
74
Q&A No.: QAH8S-204
Category: DMAC
Subject: Alternate 8-Bit/16-Bit Space Accesses
Question
Can data transfer be performed between 8-bit space and 16-bit space using the DMAC or DTC?
Answer
Yes. As the input/output bus width is managed by the bus controller, as long as the bus width is set
by the bus controller, the user can use the DMAC or DTC without having to be aware of the bus
width.
φ
Address
RD
HWR
LWR
D15 to D8
D7 to D0
16-bit access space
(external memory
read)
8-bit access space
(external memory
write)
Timing of Data Transfer from 16-Bit Access Space to 8-Bit Access Space