SH7280 Datasheet, PDF (123/1726 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine family

Section 4 Clock Pulse Generator (CPG)
4.8.3
Handling of pins when a Ceramic Resonator is not Connected (the Internal CPG is
Selected or the USB is Not in Use)
When a ceramic resonator is not connected, connect the USBEXTAL pin to ground (Vss) and
leave the USBEXTAL pin open-circuit as shown in Figure 4.8. Possible clock frequencies for
input to EXTAL are fixed to 12 MHz.
USBEXTAL
USBXTAL
Open state
Figure 4.8 Handling of Pins when a Ceramic Resonator is not Connected
Rev. 1.00 Jun. 26, 2008 Page 93 of 1692
REJ09B0393-0100