Datasheet

Section 5 Clock Pulse Generator
REJ09B0465-0300 Rev. 3.00 Page 109 of 982
Sep 17, 2010
H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group
Section 5 Clock Pulse Generator
The clock pulse generator is comprised of the main oscillator, a duty correction circuit, a low-
speed OCO (OCO: on-chip oscillator), a sub-oscillator, a clock selection circuit, a system clock
divider, a PSC divider for peripheral modules, and a φs divider for the bus master and memory.
Table 5.1 lists clock source symbols and their meanings used in this manual.
Table 5.1 Clock Source Symbols
Symbol Description
φloco Low-speed OCO output
φosc Main oscillator output clock
φsub Sub-oscillator output clock
φhigh High-speed clock (φosc)
φlow Low-speed clock (φloco or φsub)
φbase System reference clock
φ System operation clock
φs Bus master operation clock