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Table 26.2 Crystal Resonator Parameters
Frequency(MHz)
(max) (Ω Ω Ω Ω )
R
S
C
(max) (pF)
0
26.1.2
External Clock Input Method
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 (φ).
(b) Example of external clock input when an inverted clock is input to XTAL pin
5
8
100
80
7
7
EXTAL
XTAL
(a) Example of external clock input when XTAL pin left open
EXTAL
XTAL
Figure 26.4 Example of External Clock Input
Section 26 Clock Pulse Generator
10
12
70
60
7
7
External clock input
Open
External clock input
Rev. 3.00 Jan 25, 2006 page 763 of 872
16
20
50
40
7
7
REJ09B0286-0300
25
30
7
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