h8s-2111b Renesas Electronics Corporation., h8s-2111b Datasheet - Page 491

• Manufacturer Part Number: h8s-2111b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

19.1.2
Figure 19.4 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 19.3. The frequency of the external clock should be the same as that of the system
clock (φ).
External Clock Input Method
(b) Example of external clock input when an inverted clock is input to XTAL pin
Figure 19.4 Example of External Clock Input
EXTAL
XTAL
EXTAL
XTAL
(a) Example of external clock input when XTAL pin left open
Open
External clock input
External clock input
Rev. 1.00, 05/04, page 457 of 544