Datasheet

Section 5 Clock Pulse Generator
Page 138 of 982 REJ09B0465-0300 Rev. 3.00
Sep 17, 2010
H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group
5.6 Prescaler
The prescaler is a 13-bit counter using the system clock (φ) as its input clock. The outputs, which
are divided clocks, are used as internal clocks by the on-chip peripheral modules. The prescaler is
initialized to H'0000 and stops counting after a reset. It starts counting when the PSCSTP bit in
LPCR1 is cleared. The prescaler counter cannot be accessed by the CPU.
The outputs from the prescaler is shared by the on-chip peripheral modules. The division ratio can
be set separately for each on-chip peripheral module. The clock input to the prescaler is a system
clock with the division ratio specified by bits PHI2 to PHI0 in LPCR2.