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Table 27.2 Crystal Resonator Parameters
Frequency (MHz)
R
(max) (Ω)
S
C
(max) (pF)
0
27.1.2
External Clock Input Method
Figure 27.4 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 tied to high in standby
mode.
(b) Example of external clock input when an inverted clock is input to XTAL pin
When a specified clock signal is input to the EXTAL pin, internal clock signal output is
determined after the external clock output stabilization delay time (t
signal output is not determined during the t
in reset state. For the external clock output stabilization delay time, refer to section 31, Electrical
Characteristics.
5
100
7
EXTAL
XTAL
(a) Example of external clock input when XTAL pin left open
EXTAL
XTAL
Figure 27.4 Example of External Clock Input
DEXT
Section 27 Clock Pulse Generator
8
80
7
External clock input
Open
External clock input
DEXT
cycle, a reset signal should be set to low to hold it
Rev. 1.00 Mar. 12, 2008 Page 1053 of 1178
8.5
70
7
) has passed. As the clock
REJ09B0403-0100
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