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Section 5 Clock Pulse Generator
Page 120 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
Mode 2
In mode 2, clock is input from the EXTAL pin or the crystal oscillator. The PLL circuit shapes
waveforms and multiples the frequency, and then supplies the clock to the LSI. The oscillating
frequency for the crystal resonator and EXTAL pin input clock ranges from 10 to 18 MHz.
The frequency range of CKIO is from 40 to 72 MHz. To reduce current supply, fix the
USB_X1 pin (connect it to a pull-up/down resistor, the power supply, or the ground) and open
the USB_X2 pin when the USB 2.0 host/function module is not used.
Mode 3
In mode 3, clock is input from the USB_X1 pin or the crystal oscillator. The external clock is
input through this pin and waveform is shaped in the PLL circuit. Then the frequency is
multiplied according to the frequency control register setting before the clock is supplied to the
LSI. The frequency of CKIO is the same as that of the input clock (USB_X1/crystal resonator)
multiplied by 4/3, (64 MHz). To reduce current supply, fix the EXTAL pin (connect it to a
pull-up/down resistor, the power supply, or the ground) and open the XTAL pin when the LSI
is used in mode 3.