HD6432646 Hitachi, HD6432646 Datasheet - Page 752

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

Bits 1 and 0—Frequency Multiplication Factor (STC1, STC0): The STC bits specify the
frequency multiplication factor of the PLL circuit.
Bit 1
STC1
0
1
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.
718
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
Setting prohibited
are reference values. The capacitance which is used must be decided
EXTAL
XTAL
1
2
4
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)