h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 815
h8s-2158
Manufacturer Part Number
h8s-2158
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2158.pdf
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Table 26.2 Crystal Resonator Parameters
26.1.2
Figure 26.4 shows a typical method of connecting an external clock signal. To leave the XTAL pin
open, incidental capacitance should be 10 pF or less.
To input an inverted clock to the XTAL pin, the external clock should be set to high in standby
mode, subactive mode, subsleep mode, and watch mode. External clock input conditions are
shown in table 26.3. The frequency of the external clock should be the same as that of the system
clock ( ).
Frequency(MHz)
R
C
S
0
(max) (pF)
(max) ( )
External Clock Input Method
(b) Example of external clock input when an inverted clock is input to XTAL pin
EXTAL
XTAL
EXTAL
XTAL
Figure 26.4 Example of External Clock Input
5
100
7
(a) Example of external clock input when XTAL pin left open
8
80
7
10
70
7
Open
Rev. 3.00 Jan 25, 2006 page 763 of 872
12
60
7
External clock input
External clock input
Section 26 Clock Pulse Generator
16
50
7
20
40
7
REJ09B0286-0300
25
30
7
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