HD64F38602R Datasheet, PDF (102/552 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

Section 4 Clock Pulse Generators
4.3.3 External Clock Input Method
Connect the external clock to the X1 pin and leave the X2 pin open, as shown in figure 4.8.
X1
X2
Open
External clock input
Frequency
Duty
Figure 4.8 Pin Connection when Inputting External Clock
Watch Clock (φ )
W
45% to 55%
4.3.4 On-Chip Oscillator Selection Method
The on-chip oscillator is selected by the SUBSEL bit in OSCCR. When the on-chip oscillator is
selected, a resonator no longer needs to be connected to the X1 and X2 pins. In such a case, fix the
X1 pin at GND.
Rev. 3.00 May 15, 2007 Page 70 of 516
REJ09B0152-0300