SH7144 Series: Caution on use of the DTC

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Date: April 21, 2008
RENESAS TECHNICAL UPDATE
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Renesas Technology Corp.
Product
Category
Title
MPU&MCU
Document
No.
TN-SH7-A649A/E
SH7144 Series: Caution on use of the DTC
Information
Category
Technical Notification
Reference
Document
SH7144 Group, SH7145 Group
Hardware Manual
Rev. 4.0 (REJ09B0108-0400)
Rev.
1.00
Lot No.
Applicable
Product
All products of SH7144 and SH7145
All lots
Thank you for your consistent patronage of Renesas semiconductor products.
We would like to inform you of the addition of a caution on use of the DTC to the SH7144 Group hardware manuals. Please take
this information into consideration when using these products.
1. Description added
When using the DTC of the SH7144 Series, if all of the following three conditions are satisfied, an extra, unintended DTC
transfer may be performed.
(1) The clock ratio is system clock : peripheral clock (Pφ) = 2:1.
(2) Memory-to-memory transfer is specified.
(3) The CMT, MTU or MMT is specified as the activating source.
2. Memory-to-memory transfer using DTC
To avoid the unintended DTC transfer described above, ensure that any of the following three conditions is satisfied when the
DTC is used for memory-to-memory transfer.
(1) The clock ratio has any value other than system clock : peripheral clock (Pφ) = 2:1.
(2) An activating source other than the CMT, MTU and MMT is specified.
(3) Data transfer is performed by CPU instructions instead of by using the DTC.
(c) 2008. Renesas Technology Corp., All rights reserved.
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