SH7262/SH7264 Group
Hardware Design Guide
REJ06B0999-0100 Rev. 1.00
Page 10 of 36
Jun. 30, 2010
3. Oscillator
Circuit
3.1 Clock
Pins
Pins listed in the following table can be connected to crystal resonators or input clocks.
Table 3 Clock pins
Xin Pin
(Crystal resonator can be
connected, or used as
external clock input pin)
Xout Pin
(Crystal resonator can be
connected)
Remarks
EXTAL
XTAL
10 MHz to 18 MHz
USB_X1 USB_X2
•
When the USB controller is in high-speed:
48 MHz ± 100 ppm
•
When the USB controller is NOT in high-speed and
operating as the USB host:
48 MHz ± 500 ppm
•
When the USB controller is NOT in high-speed and
operating as the USB function:
48 MHz ± 2500 ppm
AUDIO_X1 AUDIO_X2
•
When connecting a crystal resonator
10 MHz to 25 MHz
•
When inputting an external clock
1 MHz to 25 MHz
RTC_X1 RTC_X2 32.768
kHz
3.2
Connecting an External Clock
Figure 6 shows an example of connecting an external clock to the SH7264. When leaving the Xout pin as open, the
parasitic capacitance must be less than 10 pF.
Xin
Xout
SH7264
External clock input
Open
Figure 6 Connecting an External Clock
