h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 760
h8s-2646
Manufacturer Part Number
h8s-2646
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2646.pdf
(1165 pages)
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Section 21 Clock Pulse Generator
Note: Make this setting so that the clock frequency both before and after multiplication is within
Note: A system clock frequency multiplied by the multiplication factor (STC1 and STC0) should
21.3
A crystal oscillator is used to supply clock pulses.
In either case, the input clock should be from 4 MHz to 20 MHz.
21.3.1
Circuit Configuration: A crystal resonator can be connected as shown in the example in figure
21.2. Select the damping resistance R
crystal should be used.
Rev. 5.00 Sep 22, 2005 page 734 of 1136
REJ09B0257-0500
Bit 1
STC1
0
1
the operating frequency range of the LSI.
not exceed the maximum operating frequency defined in section 23, Electrical
Characteristics.
Note: C
Oscillator
Connecting a Crystal Resonator
Bit 0
STC0
0
1
0
1
by the parasitic capacitance of the board and the results of crystal resonator
evaluation.
L1
and C
Figure 21.2 Connection of Crystal Resonator (Example)
L2
Description
×1
×2
×4
Setting prohibited
EXTAL
XTAL
are reference values. The capacitance which is used must be decided
d
R
according to table 21.2. An AT-cut parallel-resonance
d
C
C
L1
L2
C
L1
= C
L2
= 10 to 22pF
(Initial value)
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