h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 992

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

Section 22A Clock Pulse Generator (H8S/2636 Group, H8S/2638 Group, H8S/2630 Group)
Bits 1 and 0—Frequency Multiplication Factor (STC1, STC0): The STC bits specify the
frequency multiplication factor of the PLL circuit.
Note: The multiplication factor should be set so that the clock frequency following multiplication
22A.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 20 MHz.
22A.3.1 Connecting a Crystal Resonator
Circuit Configuration: A crystal resonator can be connected as shown in the example in figure
22A-2. Select the damping resistance R
crystal should be used.
Table 22A-2 Damping Resistance Value
Rev. 6.00 Feb 22, 2005 page 932 of 1484
REJ09B0103-0600
Bit 1
STC1
0
1
Frequency (MHz)
R
d
( )
does not exceed the maximum operating frequency of the LSI. It is possible to reduce
power consumption and noise by using a setting of PLL ×4 for this function and lowering the
external clock frequency.
Bit 0
STC0
0
1
0
1
Figure 22A-2 Connection of Crystal Resonator (Example)
Description
Setting prohibited
1
2
4
4
500
d
according to table 22A-2. An AT-cut parallel-resonance
8
200
12
0
16
0
(Initial value)
20
0