h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 1004

• Manufacturer Part Number: h8s-2635
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 22B Clock Pulse Generator (H8S/2639 Group, H8S/2635 Group)
Bits 1 and 0—Frequency Multiplication Factor (STC1, STC0): The STC bits specify the
frequency multiplication factor of the PLL circuit.
Note: A system clock frequency multiplied by the multiplication factor (STC1 and STC0) should
22B.3 Oscillator
Clock pulses may be supplied either by connecting a crystal oscillator or inputting an external
clock. In the latter case, the input clock frequency should be between 4 MHz and 5 MHz.
22B.3.1 Connecting a Crystal Resonator
Circuit Configuration: A crystal resonator can be connected as shown in the example in figure
22B-2. Select the damping resistance R
crystal should be used.
Table 22B-2 Damping Resistance Value
Rev. 6.00 Feb 22, 2005 page 944 of 1484
REJ09B0103-0600
Bit 1
STC1
0
1
Frequency (MHz)
R
d
( )
not exceed the maximum operating frequency defined in section 24, Electrical
Characteristics.
Bit 0
STC0
0
1
0
1
Figure 22B-2 Connection of Crystal Resonator (Example)
Description
Setting prohibited
1
2
4
4
500
d
according to table 22B-2. An AT-cut parallel-resonance
5
200
(Initial value)