
Rev. 2.0, 09/02, page 715 of 732
Item
Page
Revisions (See Manual for Details)
4.3.2 Notes on Board
Design
51
Description added.
Measures against radiation noise are taken in this LSI. If
further reduction in radiation noise is needed, it is
recommended to use a multiple layer board and provide a
layer exclusive to the system ground.
When using a crystal oscillator, place the crystal oscillator
and its load capacitors
Separate the PLL power lines (PLLVcc, PLLVss) and the
system power lines (Vcc, Vss) at the board power supply
source, and be sure to insert bypass capacitors CB and CPB
close to the pins.
51, 52
Description added.
In principle, electromagnetic waves are emitted from an LSI
in operation. This LSI regards the lower of the system clock
(
φ
) and the peripheral clock (P
φ
) as fundamental (for
example, if
φ
= 40 MHz and P
φ
= 40 MHz, then 40 MHz), and
the peak of electromagnetic waves is in the high frequency
band. When this LSI is used adjacent to apparatuses
sensible to electromagnetic waves such as FM/VHF band
receivers, it is recommended to use a board with at least four
layers and provide a layer exclusive to the system ground.
Figure 8.1 Block
Diagram of DTC
104
Figure amended.
memory
External device
(memory-
mapped)
Interrupt request
Bus controller
E
Description amended.
Bit
Bit Name
Description
6
CHNE
DTC Chain Transfer Enable
When this bit is set to 1, a chain
transfer will be performed.
0: Chain transfer is canceled
1: Chain transfer is set
In data transfer with CHNE set to 1,
determination of the end of the
specified number of transfers, clearing
of the activation source flag, and
clearing of DTER is not performed.
8.2.1 DTC Mode
Register (DTMR)
107