HD64F38602R Datasheet, PDF (100/552 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

Section 4 Clock Pulse Generators
4.3 Subclock Oscillator
A subclock can be provided by connecting a crystal resonator or inputting an external clock.
Either the subclock oscillator or on-chip oscillator can be selected, as shown in figure 4.1. For the
selecting method, see section 4.3.4, On-Chip Oscillator Selection Method.
4.3.1 Connecting 32.768-kHz/38.4-kHz Crystal Resonator
Figure 4.5 shows an example of connecting a 32.768-kHz or 38.4-kHz crystal resonator. Notes
described in section 4.5.2, Notes on Board Design also apply to this connection.
C₁
X1
X2
C₂
Frequency Manufacturer
38.4 kHz EPSON TOYOCOM CORPORATION
32.768 kHz EPSON TOYOCOM CORPORATION
C1 = C2 = 7 pF (typ.)
Products Name Equivalent Series Resistance
C-4-TYPE
C-001R
30 kΩ (max.)
35 kΩ (max.)
Note: Consult with the crystal resonator manufacturer to determine the parameters.
Figure 4.5 Typical Connection to 32.768-kHz/38.4-kHz Crystal Resonator
1. When the resonator other than ones listed above is used, perform matching evaluation with the
crystal resonator manufacture and connect it under the optimum condition. Even when the
resonator listed above or the equivalent is used, as the oscillation characteristics depend on the
board specification, perform matching evaluation on the mounting board.
2. Perform matching evaluation in the reset state (the RES pin is low) and on exit from the reset
state (the RES pin is driven from low to high).
Rev. 3.00 May 15, 2007 Page 68 of 516
REJ09B0152-0300