Datasheet

Table Of Contents
Section 21 Clock Pulse Generator
Page 668 of 846 REJ09B0140-0900 Rev. 9.00
Sep 16, 2010
H8S/2215 Group
The frequency of the system clock oscillator can be changed by software by means of settings in
the low-power control register (LPWRCR) and system clock control register (SCKCR). Either
USB operating clock (48 MHz) oscillator or PLL 48-MHz clock can be selected by software by
means of setting the USB control register (UCTLR). For details, refer to section 15, Universal
Serial Bus Interface (USB).
21.1 Register Descriptions
The on-chip clock pulse generator has the following registers.
System clock control register (SCKCR)
Low-power control register (LPWRCR)
21.1.1 System Clock Control Register (SCKCR)
SCKCR controls φ clock output and medium-speed mode.