h8s-2161b Renesas Electronics Corporation., h8s-2161b Datasheet - Page 689
h8s-2161b
Manufacturer Part Number
h8s-2161b
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2161B.pdf
(845 pages)
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Table 24.2 Crystal Resonator Parameters
24.1.2
Figure 24.4 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 24.3. 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 24.4 Example of External Clock Input
2
500
7
(a) Example of external clock input when XTAL pin left open
4
120
7
8
80
7
Open
10
70
7
Rev. 3.00 Mar 21, 2006 page 635 of 788
External clock input
External clock input
Section 24 Clock Pulse Generator
12
60
7
16
50
7
REJ09B0300-0300
20
40
7
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