HD6432160 RENESAS [Renesas Technology Corp], HD6432160 Datasheet - Page 651

• Manufacturer Part Number: HD6432160
• Description: Hitachi 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Table 25.2 Crystal Resonator Parameters
Frequency (MHz)
R
C
25.1.2
Figure 25.4 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 25.3. The frequency of the external clock should be the same as that of the system
clock (ø).
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 25.4 Example of External Clock Input
2
500
(a) Example of external clock input when XTAL pin left open
4
120
8
80
Open
10
70
7
External clock input
External clock input
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